Do not define _POSIX_THREADS if unistd.h defines it.

Check for pthread_sigmask before using it. Fixes remaining problem in #470781.

4 files changed, 336 insertions, 289 deletions

diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index 2592d39..7170c8a 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -75,7 +75,7 @@
  * other UNIX International compliant systems that don't have the full
  * pthread implementation.
  */
-#ifdef PY_PTHREAD_STD
+#ifdef HAVE_PTHREAD_SIGMASK
 #  define SET_THREAD_SIGMASK pthread_sigmask
 #else
 #  define SET_THREAD_SIGMASK sigprocmask
diff --git a/configure b/configure
index 4cfa96b..260ea3f 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# From configure.in Revision: 1.267 
+# From configure.in Revision: 1.268 
 
 # Guess values for system-dependent variables and create Makefiles.
 # Generated automatically using autoconf version 2.13 
@@ -3613,10 +3613,6 @@ then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     # Defining _REENTRANT on system with POSIX threads should not hurt.
     cat >> confdefs.h <<\EOF
 #define _REENTRANT 1
@@ -3631,10 +3627,6 @@ then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     posix_threads=yes
     LIBOBJS="$LIBOBJS thread.o"
 else
@@ -3644,23 +3636,49 @@ else
     if test ! -z "$withval" -a -d "$withval"
     then LDFLAGS="$LDFLAGS -L$withval"
     fi
+
+    # According to the POSIX spec, a pthreads implementation must
+    # define _POSIX_THREADS in unistd.h. Some apparently don't (which ones?)
+    echo $ac_n "checking for _POSIX_THREADS in unistd.h""... $ac_c" 1>&6
+echo "configure:3644: checking for _POSIX_THREADS in unistd.h" >&5
+    cat > conftest.$ac_ext <<EOF
+#line 3646 "configure"
+#include "confdefs.h"
+#include <unistd.h>
+     #ifdef _POSIX_THREADS
+     yes
+     #endif
+    
+EOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  egrep "yes" >/dev/null 2>&1; then
+  rm -rf conftest*
+  unistd_defines_pthreads=yes
+else
+  rm -rf conftest*
+  unistd_defines_pthreads=no
+fi
+rm -f conftest*
+
+    echo "$ac_t""$unistd_defines_pthreads" 1>&6
+
     cat >> confdefs.h <<\EOF
 #define _REENTRANT 1
 EOF
 
     ac_safe=`echo "mach/cthreads.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for mach/cthreads.h""... $ac_c" 1>&6
-echo "configure:3654: checking for mach/cthreads.h" >&5
+echo "configure:3672: checking for mach/cthreads.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3659 "configure"
+#line 3677 "configure"
 #include "confdefs.h"
 #include <mach/cthreads.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:3664: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:3682: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -3689,7 +3707,7 @@ else
   echo "$ac_t""no" 1>&6
 
     echo $ac_n "checking for --with-pth""... $ac_c" 1>&6
-echo "configure:3693: checking for --with-pth" >&5
+echo "configure:3711: checking for --with-pth" >&5
     # Check whether --with-pth or --without-pth was given.
 if test "${with_pth+set}" = set; then
   withval="$with_pth"
@@ -3715,9 +3733,9 @@ else
     _libs=$LIBS
     LIBS="$LIBS -lpthread"
     echo $ac_n "checking for pthread_create in -lpthread""... $ac_c" 1>&6
-echo "configure:3719: checking for pthread_create in -lpthread" >&5
+echo "configure:3737: checking for pthread_create in -lpthread" >&5
     cat > conftest.$ac_ext <<EOF
-#line 3721 "configure"
+#line 3739 "configure"
 #include "confdefs.h"
 #include <pthread.h>
 
@@ -3727,7 +3745,7 @@ int main() {
 pthread_create (NULL, NULL, start_routine, NULL)
 ; return 0; }
 EOF
-if { (eval echo configure:3731: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3749: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   
     echo "$ac_t""yes" 1>&6
@@ -3735,15 +3753,7 @@ if { (eval echo configure:3731: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && t
 #define WITH_THREAD 1
 EOF
 
-    case $ac_sys_system in
-      Darwin*) ;;
-      *) cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
-         posix_threads=yes
-         ;;
-    esac
+    posix_threads=yes
     LIBOBJS="$LIBOBJS thread.o"
 else
   echo "configure: failed program was:" >&5
@@ -3752,12 +3762,12 @@ else
   
     LIBS=$_libs
     echo $ac_n "checking for pthread_detach""... $ac_c" 1>&6
-echo "configure:3756: checking for pthread_detach" >&5
+echo "configure:3766: checking for pthread_detach" >&5
 if eval "test \"`echo '$''{'ac_cv_func_pthread_detach'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3761 "configure"
+#line 3771 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char pthread_detach(); below.  */
@@ -3780,7 +3790,7 @@ pthread_detach();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3784: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3794: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_pthread_detach=yes"
 else
@@ -3798,32 +3808,24 @@ if eval "test \"`echo '$ac_cv_func_'pthread_detach`\" = yes"; then
 #define WITH_THREAD 1
 EOF
 
-    case $ac_sys_system in
-      Darwin*) ;;
-      *) cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
-         posix_threads=yes
-         ;;
-    esac
+    posix_threads=yes
     LIBOBJS="$LIBOBJS thread.o"
 else
   echo "$ac_t""no" 1>&6
 
     ac_safe=`echo "kernel/OS.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for kernel/OS.h""... $ac_c" 1>&6
-echo "configure:3817: checking for kernel/OS.h" >&5
+echo "configure:3819: checking for kernel/OS.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3822 "configure"
+#line 3824 "configure"
 #include "confdefs.h"
 #include <kernel/OS.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:3827: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:3829: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -3852,7 +3854,7 @@ else
   echo "$ac_t""no" 1>&6
 
     echo $ac_n "checking for pthread_create in -lpthreads""... $ac_c" 1>&6
-echo "configure:3856: checking for pthread_create in -lpthreads" >&5
+echo "configure:3858: checking for pthread_create in -lpthreads" >&5
 ac_lib_var=`echo pthreads'_'pthread_create | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3860,7 +3862,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lpthreads  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3864 "configure"
+#line 3866 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3871,7 +3873,7 @@ int main() {
 pthread_create()
 ; return 0; }
 EOF
-if { (eval echo configure:3875: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3877: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3890,10 +3892,6 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     posix_threads=yes
     LIBS="$LIBS -lpthreads"
     LIBOBJS="$LIBOBJS thread.o"
@@ -3901,7 +3899,7 @@ else
   echo "$ac_t""no" 1>&6
 
     echo $ac_n "checking for pthread_create in -lc_r""... $ac_c" 1>&6
-echo "configure:3905: checking for pthread_create in -lc_r" >&5
+echo "configure:3903: checking for pthread_create in -lc_r" >&5
 ac_lib_var=`echo c_r'_'pthread_create | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3909,7 +3907,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lc_r  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3913 "configure"
+#line 3911 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3920,7 +3918,7 @@ int main() {
 pthread_create()
 ; return 0; }
 EOF
-if { (eval echo configure:3924: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3922: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3939,10 +3937,6 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     posix_threads=yes
     LIBS="$LIBS -lc_r"
     LIBOBJS="$LIBOBJS thread.o"
@@ -3950,7 +3944,7 @@ else
   echo "$ac_t""no" 1>&6
 
     echo $ac_n "checking for __d6_pthread_create in -lthread""... $ac_c" 1>&6
-echo "configure:3954: checking for __d6_pthread_create in -lthread" >&5
+echo "configure:3948: checking for __d6_pthread_create in -lthread" >&5
 ac_lib_var=`echo thread'_'__d6_pthread_create | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3958,7 +3952,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lthread  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3962 "configure"
+#line 3956 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3969,7 +3963,7 @@ int main() {
 __d6_pthread_create()
 ; return 0; }
 EOF
-if { (eval echo configure:3973: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3967: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3988,10 +3982,6 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     posix_threads=yes
     LIBS="$LIBS -lthread"
     LIBOBJS="$LIBOBJS thread.o"
@@ -3999,7 +3989,7 @@ else
   echo "$ac_t""no" 1>&6
 
     echo $ac_n "checking for __pthread_create_system in -lpthread""... $ac_c" 1>&6
-echo "configure:4003: checking for __pthread_create_system in -lpthread" >&5
+echo "configure:3993: checking for __pthread_create_system in -lpthread" >&5
 ac_lib_var=`echo pthread'_'__pthread_create_system | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4007,7 +3997,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lpthread  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4011 "configure"
+#line 4001 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4018,7 +4008,7 @@ int main() {
 __pthread_create_system()
 ; return 0; }
 EOF
-if { (eval echo configure:4022: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4012: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4037,10 +4027,6 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     posix_threads=yes
     LIBS="$LIBS -lpthread"
     LIBOBJS="$LIBOBJS thread.o"
@@ -4048,7 +4034,7 @@ else
   echo "$ac_t""no" 1>&6
 
     echo $ac_n "checking for pthread_create in -lcma""... $ac_c" 1>&6
-echo "configure:4052: checking for pthread_create in -lcma" >&5
+echo "configure:4038: checking for pthread_create in -lcma" >&5
 ac_lib_var=`echo cma'_'pthread_create | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4056,7 +4042,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lcma  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4060 "configure"
+#line 4046 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4067,7 +4053,7 @@ int main() {
 pthread_create()
 ; return 0; }
 EOF
-if { (eval echo configure:4071: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4057: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4086,10 +4072,6 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
 #define WITH_THREAD 1
 EOF
 
-    cat >> confdefs.h <<\EOF
-#define _POSIX_THREADS 1
-EOF
-
     posix_threads=yes
     LIBS="$LIBS -lcma"
     LIBOBJS="$LIBOBJS thread.o"
@@ -4120,8 +4102,15 @@ fi
 
 
     if test "$posix_threads" = "yes"; then
+      if test "$unistd_defines_pthreads" = "no"; then
+         cat >> confdefs.h <<\EOF
+#define _POSIX_THREADS 1
+EOF
+
+      fi
+
       echo $ac_n "checking if PTHREAD_SCOPE_SYSTEM is supported""... $ac_c" 1>&6
-echo "configure:4125: checking if PTHREAD_SCOPE_SYSTEM is supported" >&5
+echo "configure:4114: checking if PTHREAD_SCOPE_SYSTEM is supported" >&5
       if eval "test \"`echo '$''{'ac_cv_pthread_system_supported'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4129,7 +4118,7 @@ else
   ac_cv_pthread_system_supported=no
 else
   cat > conftest.$ac_ext <<EOF
-#line 4133 "configure"
+#line 4122 "configure"
 #include "confdefs.h"
 #include <pthread.h>
       void *foo(void *parm) {
@@ -4143,7 +4132,7 @@ else
         exit(0);
       }
 EOF
-if { (eval echo configure:4147: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:4136: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_pthread_system_supported=yes
 else
@@ -4165,10 +4154,65 @@ fi
 EOF
 
       fi
+      for ac_func in pthread_sigmask
+do
+echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
+echo "configure:4161: checking for $ac_func" >&5
+if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 4166 "configure"
+#include "confdefs.h"
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $ac_func(); below.  */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error.  */
+/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char $ac_func();
+
+int main() {
+
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
+choke me
+#else
+$ac_func();
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:4189: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=no"
+fi
+rm -f conftest*
+fi
+
+if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_func 1
+EOF
+ 
+else
+  echo "$ac_t""no" 1>&6
+fi
+done
+
     fi
 
     echo $ac_n "checking for usconfig in -lmpc""... $ac_c" 1>&6
-echo "configure:4172: checking for usconfig in -lmpc" >&5
+echo "configure:4216: checking for usconfig in -lmpc" >&5
 ac_lib_var=`echo mpc'_'usconfig | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4176,7 +4220,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lmpc  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4180 "configure"
+#line 4224 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4187,7 +4231,7 @@ int main() {
 usconfig()
 ; return 0; }
 EOF
-if { (eval echo configure:4191: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4235: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4214,7 +4258,7 @@ else
 fi
 
     echo $ac_n "checking for thr_create in -lthread""... $ac_c" 1>&6
-echo "configure:4218: checking for thr_create in -lthread" >&5
+echo "configure:4262: checking for thr_create in -lthread" >&5
 ac_lib_var=`echo thread'_'thr_create | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4222,7 +4266,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lthread  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4226 "configure"
+#line 4270 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4233,7 +4277,7 @@ int main() {
 thr_create()
 ; return 0; }
 EOF
-if { (eval echo configure:4237: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4281: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4272,7 +4316,7 @@ fi
 
 # Check for enable-ipv6
 echo $ac_n "checking if --enable-ipv6 is specified""... $ac_c" 1>&6
-echo "configure:4276: checking if --enable-ipv6 is specified" >&5
+echo "configure:4320: checking if --enable-ipv6 is specified" >&5
 # Check whether --enable-ipv6 or --disable-ipv6 was given.
 if test "${enable_ipv6+set}" = set; then
   enableval="$enable_ipv6"
@@ -4297,7 +4341,7 @@ else
 
 else
   cat > conftest.$ac_ext <<EOF
-#line 4301 "configure"
+#line 4345 "configure"
 #include "confdefs.h"
  /* AF_INET6 available check */
 #include <sys/types.h>
@@ -4311,7 +4355,7 @@ main()
 }
 
 EOF
-if { (eval echo configure:4315: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:4359: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   echo "$ac_t""yes" 1>&6
   ipv6=yes
@@ -4328,9 +4372,9 @@ fi
 
 if test "$ipv6" = "yes"; then
 	echo $ac_n "checking if RFC2553 API is available""... $ac_c" 1>&6
-echo "configure:4332: checking if RFC2553 API is available" >&5
+echo "configure:4376: checking if RFC2553 API is available" >&5
 	cat > conftest.$ac_ext <<EOF
-#line 4334 "configure"
+#line 4378 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <netinet/in.h>
@@ -4339,7 +4383,7 @@ struct sockaddr_in6 x;
 x.sin6_scope_id;
 ; return 0; }
 EOF
-if { (eval echo configure:4343: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4387: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   echo "$ac_t""yes" 1>&6
 		ipv6=yes
@@ -4369,13 +4413,13 @@ ipv6trylibc=no
 
 if test "$ipv6" = "yes"; then
 	echo $ac_n "checking ipv6 stack type""... $ac_c" 1>&6
-echo "configure:4373: checking ipv6 stack type" >&5
+echo "configure:4417: checking ipv6 stack type" >&5
 	for i in inria kame linux-glibc linux-inet6 solaris toshiba v6d zeta;
 	do
 		case $i in
 		inria)
 						cat > conftest.$ac_ext <<EOF
-#line 4379 "configure"
+#line 4423 "configure"
 #include "confdefs.h"
 
 #include <netinet/in.h>
@@ -4394,7 +4438,7 @@ rm -f conftest*
 			;;
 		kame)
 						cat > conftest.$ac_ext <<EOF
-#line 4398 "configure"
+#line 4442 "configure"
 #include "confdefs.h"
 
 #include <netinet/in.h>
@@ -4416,7 +4460,7 @@ rm -f conftest*
 			;;
 		linux-glibc)
 						cat > conftest.$ac_ext <<EOF
-#line 4420 "configure"
+#line 4464 "configure"
 #include "confdefs.h"
 
 #include <features.h>
@@ -4453,7 +4497,7 @@ rm -f conftest*
 			;;
 		toshiba)
 			cat > conftest.$ac_ext <<EOF
-#line 4457 "configure"
+#line 4501 "configure"
 #include "confdefs.h"
 
 #include <sys/param.h>
@@ -4474,7 +4518,7 @@ rm -f conftest*
 			;;
 		v6d)
 			cat > conftest.$ac_ext <<EOF
-#line 4478 "configure"
+#line 4522 "configure"
 #include "confdefs.h"
 
 #include </usr/local/v6/include/sys/v6config.h>
@@ -4495,7 +4539,7 @@ rm -f conftest*
 			;;
 		zeta)
 			cat > conftest.$ac_ext <<EOF
-#line 4499 "configure"
+#line 4543 "configure"
 #include "confdefs.h"
 
 #include <sys/param.h>
@@ -4540,7 +4584,7 @@ fi
 
 # Check for GC support
 echo $ac_n "checking for --with-cycle-gc""... $ac_c" 1>&6
-echo "configure:4544: checking for --with-cycle-gc" >&5
+echo "configure:4588: checking for --with-cycle-gc" >&5
 # Check whether --with-cycle-gc or --without-cycle-gc was given.
 if test "${with_cycle_gc+set}" = set; then
   withval="$with_cycle_gc"
@@ -4562,7 +4606,7 @@ echo "$ac_t""$with_cycle_gc" 1>&6
 
 # Check for Python-specific malloc support
 echo $ac_n "checking for --with-pymalloc""... $ac_c" 1>&6
-echo "configure:4566: checking for --with-pymalloc" >&5
+echo "configure:4610: checking for --with-pymalloc" >&5
 # Check whether --with-pymalloc or --without-pymalloc was given.
 if test "${with_pymalloc+set}" = set; then
   withval="$with_pymalloc"
@@ -4581,7 +4625,7 @@ fi
 
 # Check for --with-wctype-functions
 echo $ac_n "checking for --with-wctype-functions""... $ac_c" 1>&6
-echo "configure:4585: checking for --with-wctype-functions" >&5
+echo "configure:4629: checking for --with-wctype-functions" >&5
 # Check whether --with-wctype-functions or --without-wctype-functions was given.
 if test "${with_wctype_functions+set}" = set; then
   withval="$with_wctype_functions"
@@ -4603,7 +4647,7 @@ fi
 DLINCLDIR=.
 
 echo $ac_n "checking for --with-sgi-dl""... $ac_c" 1>&6
-echo "configure:4607: checking for --with-sgi-dl" >&5
+echo "configure:4651: checking for --with-sgi-dl" >&5
 # Check whether --with-sgi-dl or --without-sgi-dl was given.
 if test "${with_sgi_dl+set}" = set; then
   withval="$with_sgi_dl"
@@ -4627,7 +4671,7 @@ fi
 
 
 echo $ac_n "checking for --with-dl-dld""... $ac_c" 1>&6
-echo "configure:4631: checking for --with-dl-dld" >&5
+echo "configure:4675: checking for --with-dl-dld" >&5
 # Check whether --with-dl-dld or --without-dl-dld was given.
 if test "${with_dl_dld+set}" = set; then
   withval="$with_dl_dld"
@@ -4656,12 +4700,12 @@ fi
 for ac_func in dlopen
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:4660: checking for $ac_func" >&5
+echo "configure:4704: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4665 "configure"
+#line 4709 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -4684,7 +4728,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4688: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4732: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -4713,7 +4757,7 @@ done
 # loading of modules.
 
 echo $ac_n "checking DYNLOADFILE""... $ac_c" 1>&6
-echo "configure:4717: checking DYNLOADFILE" >&5
+echo "configure:4761: checking DYNLOADFILE" >&5
 if test -z "$DYNLOADFILE"
 then
 	case $ac_sys_system/$ac_sys_release in
@@ -4744,7 +4788,7 @@ fi
 
 
 echo $ac_n "checking MACHDEP_OBJS""... $ac_c" 1>&6
-echo "configure:4748: checking MACHDEP_OBJS" >&5
+echo "configure:4792: checking MACHDEP_OBJS" >&5
 if test -z "$MACHDEP_OBJS"
 then
 	MACHDEP_OBJS=$extra_machdep_objs
@@ -4767,12 +4811,12 @@ for ac_func in alarm chown chroot clock confstr ctermid ctermid_r execv \
  truncate uname waitpid _getpty getpriority
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:4771: checking for $ac_func" >&5
+echo "configure:4815: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4776 "configure"
+#line 4820 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -4795,7 +4839,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4799: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4843: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -4825,12 +4869,12 @@ done
 for ac_func in openpty
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:4829: checking for $ac_func" >&5
+echo "configure:4873: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4834 "configure"
+#line 4878 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -4853,7 +4897,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4857: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4901: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -4875,7 +4919,7 @@ EOF
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for openpty in -lutil""... $ac_c" 1>&6
-echo "configure:4879: checking for openpty in -lutil" >&5
+echo "configure:4923: checking for openpty in -lutil" >&5
 ac_lib_var=`echo util'_'openpty | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4883,7 +4927,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lutil  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4887 "configure"
+#line 4931 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4894,7 +4938,7 @@ int main() {
 openpty()
 ; return 0; }
 EOF
-if { (eval echo configure:4898: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4942: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4923,12 +4967,12 @@ done
 for ac_func in forkpty
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:4927: checking for $ac_func" >&5
+echo "configure:4971: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4932 "configure"
+#line 4976 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -4951,7 +4995,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4955: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4999: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -4973,7 +5017,7 @@ EOF
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for forkpty in -lutil""... $ac_c" 1>&6
-echo "configure:4977: checking for forkpty in -lutil" >&5
+echo "configure:5021: checking for forkpty in -lutil" >&5
 ac_lib_var=`echo util'_'forkpty | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4981,7 +5025,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lutil  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4985 "configure"
+#line 5029 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4992,7 +5036,7 @@ int main() {
 forkpty()
 ; return 0; }
 EOF
-if { (eval echo configure:4996: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5040: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -5023,12 +5067,12 @@ done
 for ac_func in fseek64 fseeko fstatvfs ftell64 ftello statvfs
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5027: checking for $ac_func" >&5
+echo "configure:5071: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5032 "configure"
+#line 5076 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5051,7 +5095,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5055: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5099: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5079,12 +5123,12 @@ done
 for ac_func in dup2 getcwd strdup strerror memmove
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5083: checking for $ac_func" >&5
+echo "configure:5127: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5088 "configure"
+#line 5132 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5107,7 +5151,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5111: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5155: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5136,12 +5180,12 @@ done
 for ac_func in getpgrp
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5140: checking for $ac_func" >&5
+echo "configure:5184: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5145 "configure"
+#line 5189 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5164,7 +5208,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5168: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5212: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5183,14 +5227,14 @@ if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
 #define $ac_tr_func 1
 EOF
  cat > conftest.$ac_ext <<EOF
-#line 5187 "configure"
+#line 5231 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 int main() {
 getpgrp(0);
 ; return 0; }
 EOF
-if { (eval echo configure:5194: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5238: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define GETPGRP_HAVE_ARG 1
@@ -5209,12 +5253,12 @@ done
 for ac_func in setpgrp
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5213: checking for $ac_func" >&5
+echo "configure:5257: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5218 "configure"
+#line 5262 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5237,7 +5281,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5241: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5285: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5256,14 +5300,14 @@ if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
 #define $ac_tr_func 1
 EOF
  cat > conftest.$ac_ext <<EOF
-#line 5260 "configure"
+#line 5304 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 int main() {
 setpgrp(0,0);
 ; return 0; }
 EOF
-if { (eval echo configure:5267: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5311: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define SETPGRP_HAVE_ARG 1
@@ -5282,12 +5326,12 @@ done
 for ac_func in gettimeofday
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5286: checking for $ac_func" >&5
+echo "configure:5330: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5291 "configure"
+#line 5335 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5310,7 +5354,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5314: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5358: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5329,14 +5373,14 @@ if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
 #define $ac_tr_func 1
 EOF
  cat > conftest.$ac_ext <<EOF
-#line 5333 "configure"
+#line 5377 "configure"
 #include "confdefs.h"
 #include <sys/time.h>
 int main() {
 gettimeofday((struct timeval*)0,(struct timezone*)0);
 ; return 0; }
 EOF
-if { (eval echo configure:5340: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5384: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   :
 else
   echo "configure: failed program was:" >&5
@@ -5357,12 +5401,12 @@ done
 for ac_func in getaddrinfo
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5361: checking for $ac_func" >&5
+echo "configure:5405: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5366 "configure"
+#line 5410 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5385,7 +5429,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5389: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5433: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5404,13 +5448,13 @@ if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
 #define $ac_tr_func 1
 EOF
  echo $ac_n "checking getaddrinfo bug""... $ac_c" 1>&6
-echo "configure:5408: checking getaddrinfo bug" >&5
+echo "configure:5452: checking getaddrinfo bug" >&5
 if test "$cross_compiling" = yes; then
   echo "$ac_t""buggy" 1>&6
 buggygetaddrinfo=yes
 else
   cat > conftest.$ac_ext <<EOF
-#line 5414 "configure"
+#line 5458 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -5499,7 +5543,7 @@ main()
 }
 
 EOF
-if { (eval echo configure:5503: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:5547: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   echo "$ac_t""good" 1>&6
 buggygetaddrinfo=no
@@ -5530,12 +5574,12 @@ fi
 for ac_func in getnameinfo
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5534: checking for $ac_func" >&5
+echo "configure:5578: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5539 "configure"
+#line 5583 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5558,7 +5602,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5562: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5606: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5585,12 +5629,12 @@ done
 
 # checks for structures
 echo $ac_n "checking whether time.h and sys/time.h may both be included""... $ac_c" 1>&6
-echo "configure:5589: checking whether time.h and sys/time.h may both be included" >&5
+echo "configure:5633: checking whether time.h and sys/time.h may both be included" >&5
 if eval "test \"`echo '$''{'ac_cv_header_time'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5594 "configure"
+#line 5638 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/time.h>
@@ -5599,7 +5643,7 @@ int main() {
 struct tm *tp;
 ; return 0; }
 EOF
-if { (eval echo configure:5603: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5647: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_header_time=yes
 else
@@ -5620,12 +5664,12 @@ EOF
 fi
 
 echo $ac_n "checking whether struct tm is in sys/time.h or time.h""... $ac_c" 1>&6
-echo "configure:5624: checking whether struct tm is in sys/time.h or time.h" >&5
+echo "configure:5668: checking whether struct tm is in sys/time.h or time.h" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_tm'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5629 "configure"
+#line 5673 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <time.h>
@@ -5633,7 +5677,7 @@ int main() {
 struct tm *tp; tp->tm_sec;
 ; return 0; }
 EOF
-if { (eval echo configure:5637: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5681: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm=time.h
 else
@@ -5654,12 +5698,12 @@ EOF
 fi
 
 echo $ac_n "checking for tm_zone in struct tm""... $ac_c" 1>&6
-echo "configure:5658: checking for tm_zone in struct tm" >&5
+echo "configure:5702: checking for tm_zone in struct tm" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_tm_zone'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5663 "configure"
+#line 5707 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <$ac_cv_struct_tm>
@@ -5667,7 +5711,7 @@ int main() {
 struct tm tm; tm.tm_zone;
 ; return 0; }
 EOF
-if { (eval echo configure:5671: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5715: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_tm_zone=yes
 else
@@ -5687,12 +5731,12 @@ EOF
 
 else
   echo $ac_n "checking for tzname""... $ac_c" 1>&6
-echo "configure:5691: checking for tzname" >&5
+echo "configure:5735: checking for tzname" >&5
 if eval "test \"`echo '$''{'ac_cv_var_tzname'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5696 "configure"
+#line 5740 "configure"
 #include "confdefs.h"
 #include <time.h>
 #ifndef tzname /* For SGI.  */
@@ -5702,7 +5746,7 @@ int main() {
 atoi(*tzname);
 ; return 0; }
 EOF
-if { (eval echo configure:5706: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5750: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_var_tzname=yes
 else
@@ -5725,19 +5769,19 @@ fi
 
 
 echo $ac_n "checking for time.h that defines altzone""... $ac_c" 1>&6
-echo "configure:5729: checking for time.h that defines altzone" >&5
+echo "configure:5773: checking for time.h that defines altzone" >&5
 if eval "test \"`echo '$''{'ac_cv_header_time_altzone'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5734 "configure"
+#line 5778 "configure"
 #include "confdefs.h"
 #include <time.h>
 int main() {
 return altzone;
 ; return 0; }
 EOF
-if { (eval echo configure:5741: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5785: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_header_time_altzone=yes
 else
@@ -5759,9 +5803,9 @@ fi
 
 was_it_defined=no
 echo $ac_n "checking whether sys/select.h and sys/time.h may both be included""... $ac_c" 1>&6
-echo "configure:5763: checking whether sys/select.h and sys/time.h may both be included" >&5
+echo "configure:5807: checking whether sys/select.h and sys/time.h may both be included" >&5
 cat > conftest.$ac_ext <<EOF
-#line 5765 "configure"
+#line 5809 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -5772,7 +5816,7 @@ int main() {
 ;
 ; return 0; }
 EOF
-if { (eval echo configure:5776: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5820: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define SYS_SELECT_WITH_SYS_TIME 1
@@ -5786,12 +5830,12 @@ rm -f conftest*
 echo "$ac_t""$was_it_defined" 1>&6
 
 echo $ac_n "checking for addrinfo""... $ac_c" 1>&6
-echo "configure:5790: checking for addrinfo" >&5
+echo "configure:5834: checking for addrinfo" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_addrinfo'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5795 "configure"
+#line 5839 "configure"
 #include "confdefs.h"
 
 #		include <netdb.h>
@@ -5799,7 +5843,7 @@ int main() {
 struct addrinfo a
 ; return 0; }
 EOF
-if { (eval echo configure:5803: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5847: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_addrinfo=yes
 else
@@ -5820,12 +5864,12 @@ EOF
 fi
 
 echo $ac_n "checking for sockaddr_storage""... $ac_c" 1>&6
-echo "configure:5824: checking for sockaddr_storage" >&5
+echo "configure:5868: checking for sockaddr_storage" >&5
 if eval "test \"`echo '$''{'ac_cv_struct_sockaddr_storage'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5829 "configure"
+#line 5873 "configure"
 #include "confdefs.h"
 
 #		include <sys/types.h>
@@ -5834,7 +5878,7 @@ int main() {
 struct sockaddr_storage s
 ; return 0; }
 EOF
-if { (eval echo configure:5838: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:5882: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_struct_sockaddr_storage=yes
 else
@@ -5857,14 +5901,14 @@ fi
 # checks for compiler characteristics
 
 echo $ac_n "checking whether char is unsigned""... $ac_c" 1>&6
-echo "configure:5861: checking whether char is unsigned" >&5
+echo "configure:5905: checking whether char is unsigned" >&5
 if eval "test \"`echo '$''{'ac_cv_c_char_unsigned'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   if test "$GCC" = yes; then
   # GCC predefines this symbol on systems where it applies.
 cat > conftest.$ac_ext <<EOF
-#line 5868 "configure"
+#line 5912 "configure"
 #include "confdefs.h"
 #ifdef __CHAR_UNSIGNED__
   yes
@@ -5886,7 +5930,7 @@ if test "$cross_compiling" = yes; then
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 5890 "configure"
+#line 5934 "configure"
 #include "confdefs.h"
 /* volatile prevents gcc2 from optimizing the test away on sparcs.  */
 #if !defined(__STDC__) || __STDC__ != 1
@@ -5896,7 +5940,7 @@ main() {
   volatile char c = 255; exit(c < 0);
 }
 EOF
-if { (eval echo configure:5900: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:5944: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_char_unsigned=yes
 else
@@ -5920,12 +5964,12 @@ EOF
 fi
 
 echo $ac_n "checking for working const""... $ac_c" 1>&6
-echo "configure:5924: checking for working const" >&5
+echo "configure:5968: checking for working const" >&5
 if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5929 "configure"
+#line 5973 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -5974,7 +6018,7 @@ ccp = (char const *const *) p;
 
 ; return 0; }
 EOF
-if { (eval echo configure:5978: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6022: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_const=yes
 else
@@ -5997,16 +6041,16 @@ fi
 
 works=no
 echo $ac_n "checking for working volatile""... $ac_c" 1>&6
-echo "configure:6001: checking for working volatile" >&5
+echo "configure:6045: checking for working volatile" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6003 "configure"
+#line 6047 "configure"
 #include "confdefs.h"
 
 int main() {
 volatile int x; x = 0;
 ; return 0; }
 EOF
-if { (eval echo configure:6010: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6054: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   works=yes
 else
@@ -6023,16 +6067,16 @@ echo "$ac_t""$works" 1>&6
 
 works=no
 echo $ac_n "checking for working signed char""... $ac_c" 1>&6
-echo "configure:6027: checking for working signed char" >&5
+echo "configure:6071: checking for working signed char" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6029 "configure"
+#line 6073 "configure"
 #include "confdefs.h"
 
 int main() {
 signed char c;
 ; return 0; }
 EOF
-if { (eval echo configure:6036: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6080: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   works=yes
 else
@@ -6049,16 +6093,16 @@ echo "$ac_t""$works" 1>&6
 
 have_prototypes=no
 echo $ac_n "checking for prototypes""... $ac_c" 1>&6
-echo "configure:6053: checking for prototypes" >&5
+echo "configure:6097: checking for prototypes" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6055 "configure"
+#line 6099 "configure"
 #include "confdefs.h"
 int foo(int x) { return 0; }
 int main() {
 return foo(10);
 ; return 0; }
 EOF
-if { (eval echo configure:6062: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6106: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_PROTOTYPES 1
@@ -6073,9 +6117,9 @@ echo "$ac_t""$have_prototypes" 1>&6
 
 works=no
 echo $ac_n "checking for variable length prototypes and stdarg.h""... $ac_c" 1>&6
-echo "configure:6077: checking for variable length prototypes and stdarg.h" >&5
+echo "configure:6121: checking for variable length prototypes and stdarg.h" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6079 "configure"
+#line 6123 "configure"
 #include "confdefs.h"
 
 #include <stdarg.h>
@@ -6092,7 +6136,7 @@ int main() {
 return foo(10, "", 3.14);
 ; return 0; }
 EOF
-if { (eval echo configure:6096: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6140: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_STDARG_PROTOTYPES 1
@@ -6108,16 +6152,16 @@ echo "$ac_t""$works" 1>&6
 if test "$have_prototypes" = yes; then
 bad_prototypes=no
 echo $ac_n "checking for bad exec* prototypes""... $ac_c" 1>&6
-echo "configure:6112: checking for bad exec* prototypes" >&5
+echo "configure:6156: checking for bad exec* prototypes" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6114 "configure"
+#line 6158 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 int main() {
 char **t;execve("@",t,t);
 ; return 0; }
 EOF
-if { (eval echo configure:6121: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6165: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   :
 else
   echo "configure: failed program was:" >&5
@@ -6134,9 +6178,9 @@ fi
 
 # check if sockaddr has sa_len member
 echo $ac_n "checking if sockaddr has sa_len member""... $ac_c" 1>&6
-echo "configure:6138: checking if sockaddr has sa_len member" >&5
+echo "configure:6182: checking if sockaddr has sa_len member" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6140 "configure"
+#line 6184 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -6145,7 +6189,7 @@ struct sockaddr x;
 x.sa_len = 0;
 ; return 0; }
 EOF
-if { (eval echo configure:6149: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6193: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   echo "$ac_t""yes" 1>&6
 	cat >> confdefs.h <<\EOF
@@ -6161,7 +6205,7 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking for bad static forward""... $ac_c" 1>&6
-echo "configure:6165: checking for bad static forward" >&5
+echo "configure:6209: checking for bad static forward" >&5
 if eval "test \"`echo '$''{'ac_cv_bad_static_forward'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -6169,7 +6213,7 @@ else
   ac_cv_bad_static_forward=no
 else
   cat > conftest.$ac_ext <<EOF
-#line 6173 "configure"
+#line 6217 "configure"
 #include "confdefs.h"
 
 struct s { int a; int b; };
@@ -6184,7 +6228,7 @@ main() {
  exit(!((int)&foo == foobar()));
 }
 EOF
-if { (eval echo configure:6188: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:6232: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_bad_static_forward=no
 else
@@ -6209,9 +6253,9 @@ fi
 
 va_list_is_array=no
 echo $ac_n "checking whether va_list is an array""... $ac_c" 1>&6
-echo "configure:6213: checking whether va_list is an array" >&5
+echo "configure:6257: checking whether va_list is an array" >&5
 cat > conftest.$ac_ext <<EOF
-#line 6215 "configure"
+#line 6259 "configure"
 #include "confdefs.h"
 
 #ifdef HAVE_STDARG_PROTOTYPES
@@ -6224,7 +6268,7 @@ int main() {
 va_list list1, list2; list1 = list2;
 ; return 0; }
 EOF
-if { (eval echo configure:6228: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6272: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   :
 else
   echo "configure: failed program was:" >&5
@@ -6240,12 +6284,12 @@ echo "$ac_t""$va_list_is_array" 1>&6
 
 # sigh -- gethostbyname_r is a mess; it can have 3, 5 or 6 arguments :-(
 echo $ac_n "checking for gethostbyname_r""... $ac_c" 1>&6
-echo "configure:6244: checking for gethostbyname_r" >&5
+echo "configure:6288: checking for gethostbyname_r" >&5
 if eval "test \"`echo '$''{'ac_cv_func_gethostbyname_r'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6249 "configure"
+#line 6293 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char gethostbyname_r(); below.  */
@@ -6268,7 +6312,7 @@ gethostbyname_r();
 
 ; return 0; }
 EOF
-if { (eval echo configure:6272: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6316: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_gethostbyname_r=yes"
 else
@@ -6288,11 +6332,11 @@ if eval "test \"`echo '$ac_cv_func_'gethostbyname_r`\" = yes"; then
 EOF
 
   echo $ac_n "checking gethostbyname_r with 6 args""... $ac_c" 1>&6
-echo "configure:6292: checking gethostbyname_r with 6 args" >&5
+echo "configure:6336: checking gethostbyname_r with 6 args" >&5
   OLD_CFLAGS=$CFLAGS
   CFLAGS="$CFLAGS $MY_CPPFLAGS $MY_THREAD_CPPFLAGS $MY_CFLAGS"
   cat > conftest.$ac_ext <<EOF
-#line 6296 "configure"
+#line 6340 "configure"
 #include "confdefs.h"
 
 #   include <netdb.h>
@@ -6309,7 +6353,7 @@ int main() {
   
 ; return 0; }
 EOF
-if { (eval echo configure:6313: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6357: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
     cat >> confdefs.h <<\EOF
@@ -6329,9 +6373,9 @@ else
   
     echo "$ac_t""no" 1>&6
     echo $ac_n "checking gethostbyname_r with 5 args""... $ac_c" 1>&6
-echo "configure:6333: checking gethostbyname_r with 5 args" >&5
+echo "configure:6377: checking gethostbyname_r with 5 args" >&5
     cat > conftest.$ac_ext <<EOF
-#line 6335 "configure"
+#line 6379 "configure"
 #include "confdefs.h"
 
 #     include <netdb.h>
@@ -6348,7 +6392,7 @@ int main() {
     
 ; return 0; }
 EOF
-if { (eval echo configure:6352: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6396: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
       cat >> confdefs.h <<\EOF
@@ -6368,9 +6412,9 @@ else
   
       echo "$ac_t""no" 1>&6
       echo $ac_n "checking gethostbyname_r with 3 args""... $ac_c" 1>&6
-echo "configure:6372: checking gethostbyname_r with 3 args" >&5
+echo "configure:6416: checking gethostbyname_r with 3 args" >&5
       cat > conftest.$ac_ext <<EOF
-#line 6374 "configure"
+#line 6418 "configure"
 #include "confdefs.h"
 
 #       include <netdb.h>
@@ -6385,7 +6429,7 @@ int main() {
       
 ; return 0; }
 EOF
-if { (eval echo configure:6389: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6433: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   
         cat >> confdefs.h <<\EOF
@@ -6421,12 +6465,12 @@ else
   for ac_func in gethostbyname
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:6425: checking for $ac_func" >&5
+echo "configure:6469: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6430 "configure"
+#line 6474 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -6449,7 +6493,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:6453: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6497: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -6487,12 +6531,12 @@ fi
 
 # Linux requires this for correct f.p. operations
 echo $ac_n "checking for __fpu_control""... $ac_c" 1>&6
-echo "configure:6491: checking for __fpu_control" >&5
+echo "configure:6535: checking for __fpu_control" >&5
 if eval "test \"`echo '$''{'ac_cv_func___fpu_control'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6496 "configure"
+#line 6540 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char __fpu_control(); below.  */
@@ -6515,7 +6559,7 @@ __fpu_control();
 
 ; return 0; }
 EOF
-if { (eval echo configure:6519: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6563: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func___fpu_control=yes"
 else
@@ -6533,7 +6577,7 @@ if eval "test \"`echo '$ac_cv_func_'__fpu_control`\" = yes"; then
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for __fpu_control in -lieee""... $ac_c" 1>&6
-echo "configure:6537: checking for __fpu_control in -lieee" >&5
+echo "configure:6581: checking for __fpu_control in -lieee" >&5
 ac_lib_var=`echo ieee'_'__fpu_control | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -6541,7 +6585,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lieee  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 6545 "configure"
+#line 6589 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -6552,7 +6596,7 @@ int main() {
 __fpu_control()
 ; return 0; }
 EOF
-if { (eval echo configure:6556: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6600: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -6585,7 +6629,7 @@ fi
 
 # Check for --with-fpectl
 echo $ac_n "checking for --with-fpectl""... $ac_c" 1>&6
-echo "configure:6589: checking for --with-fpectl" >&5
+echo "configure:6633: checking for --with-fpectl" >&5
 # Check whether --with-fpectl or --without-fpectl was given.
 if test "${with_fpectl+set}" = set; then
   withval="$with_fpectl"
@@ -6610,7 +6654,7 @@ BeOS) ;;
 *) LIBM=-lm
 esac
 echo $ac_n "checking for --with-libm=STRING""... $ac_c" 1>&6
-echo "configure:6614: checking for --with-libm=STRING" >&5
+echo "configure:6658: checking for --with-libm=STRING" >&5
 # Check whether --with-libm or --without-libm was given.
 if test "${with_libm+set}" = set; then
   withval="$with_libm"
@@ -6631,7 +6675,7 @@ fi
 # check for --with-libc=...
 
 echo $ac_n "checking for --with-libc=STRING""... $ac_c" 1>&6
-echo "configure:6635: checking for --with-libc=STRING" >&5
+echo "configure:6679: checking for --with-libc=STRING" >&5
 # Check whether --with-libc or --without-libc was given.
 if test "${with_libc+set}" = set; then
   withval="$with_libc"
@@ -6655,12 +6699,12 @@ LIBS="$LIBS $LIBM"
 for ac_func in hypot
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:6659: checking for $ac_func" >&5
+echo "configure:6703: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6664 "configure"
+#line 6708 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -6683,7 +6727,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:6687: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6731: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -6713,7 +6757,7 @@ LIBS=$LIBS_SAVE
 
 # check whether malloc(0) returns NULL or not
 echo $ac_n "checking what malloc(0) returns""... $ac_c" 1>&6
-echo "configure:6717: checking what malloc(0) returns" >&5
+echo "configure:6761: checking what malloc(0) returns" >&5
 if eval "test \"`echo '$''{'ac_cv_malloc_zero'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -6721,7 +6765,7 @@ else
   ac_cv_malloc_zero=nonnull
 else
   cat > conftest.$ac_ext <<EOF
-#line 6725 "configure"
+#line 6769 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 #ifdef HAVE_STDLIB
@@ -6740,7 +6784,7 @@ main() {
 	exit(0);
 }
 EOF
-if { (eval echo configure:6744: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:6788: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_malloc_zero=nonnull
 else
@@ -6766,17 +6810,17 @@ fi
 # check for wchar.h
 ac_safe=`echo "wchar.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for wchar.h""... $ac_c" 1>&6
-echo "configure:6770: checking for wchar.h" >&5
+echo "configure:6814: checking for wchar.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6775 "configure"
+#line 6819 "configure"
 #include "confdefs.h"
 #include <wchar.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:6780: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:6824: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -6807,7 +6851,7 @@ fi
 if test "$wchar_h" = yes
 then
   echo $ac_n "checking size of wchar_t""... $ac_c" 1>&6
-echo "configure:6811: checking size of wchar_t" >&5
+echo "configure:6855: checking size of wchar_t" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_wchar_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -6815,7 +6859,7 @@ else
   ac_cv_sizeof_wchar_t=4
 else
   cat > conftest.$ac_ext <<EOF
-#line 6819 "configure"
+#line 6863 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 main()
@@ -6826,7 +6870,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:6830: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:6874: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_wchar_t=`cat conftestval`
 else
@@ -6848,7 +6892,7 @@ EOF
 fi
 
 echo $ac_n "checking what type to use for unicode""... $ac_c" 1>&6
-echo "configure:6852: checking what type to use for unicode" >&5
+echo "configure:6896: checking what type to use for unicode" >&5
 # Check whether --enable-unicode or --disable-unicode was given.
 if test "${enable_unicode+set}" = set; then
   enableval="$enable_unicode"
@@ -6923,14 +6967,14 @@ fi
 
 # check for endianness
 echo $ac_n "checking whether byte ordering is bigendian""... $ac_c" 1>&6
-echo "configure:6927: checking whether byte ordering is bigendian" >&5
+echo "configure:6971: checking whether byte ordering is bigendian" >&5
 if eval "test \"`echo '$''{'ac_cv_c_bigendian'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_bigendian=unknown
 # See if sys/param.h defines the BYTE_ORDER macro.
 cat > conftest.$ac_ext <<EOF
-#line 6934 "configure"
+#line 6978 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -6941,11 +6985,11 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:6945: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6989: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   # It does; now see whether it defined to BIG_ENDIAN or not.
 cat > conftest.$ac_ext <<EOF
-#line 6949 "configure"
+#line 6993 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -6956,7 +7000,7 @@ int main() {
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:6960: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:7004: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_bigendian=yes
 else
@@ -6976,7 +7020,7 @@ if test "$cross_compiling" = yes; then
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 6980 "configure"
+#line 7024 "configure"
 #include "confdefs.h"
 main () {
   /* Are we little or big endian?  From Harbison&Steele.  */
@@ -6989,7 +7033,7 @@ main () {
   exit (u.c[sizeof (long) - 1] == 1);
 }
 EOF
-if { (eval echo configure:6993: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:7037: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_bigendian=no
 else
@@ -7016,7 +7060,7 @@ fi
 # Check whether right shifting a negative integer extends the sign bit
 # or fills with zeros (like the Cray J90, according to Tim Peters).
 echo $ac_n "checking whether right shift extends the sign bit""... $ac_c" 1>&6
-echo "configure:7020: checking whether right shift extends the sign bit" >&5
+echo "configure:7064: checking whether right shift extends the sign bit" >&5
 if eval "test \"`echo '$''{'ac_cv_rshift_extends_sign'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7025,7 +7069,7 @@ if test "$cross_compiling" = yes; then
   ac_cv_rshift_extends_sign=yes
 else
   cat > conftest.$ac_ext <<EOF
-#line 7029 "configure"
+#line 7073 "configure"
 #include "confdefs.h"
 
 int main()
@@ -7034,7 +7078,7 @@ int main()
 }
 
 EOF
-if { (eval echo configure:7038: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:7082: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_rshift_extends_sign=yes
 else
@@ -7059,13 +7103,13 @@ fi
 
 # check for getc_unlocked and related locking functions
 echo $ac_n "checking for getc_unlocked() and friends""... $ac_c" 1>&6
-echo "configure:7063: checking for getc_unlocked() and friends" >&5
+echo "configure:7107: checking for getc_unlocked() and friends" >&5
 if eval "test \"`echo '$''{'ac_cv_have_getc_unlocked'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   
 cat > conftest.$ac_ext <<EOF
-#line 7069 "configure"
+#line 7113 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 int main() {
@@ -7077,7 +7121,7 @@ int main() {
 
 ; return 0; }
 EOF
-if { (eval echo configure:7081: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7125: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_have_getc_unlocked=yes
 else
@@ -7100,7 +7144,7 @@ fi
 
 # check for readline 4.0
 echo $ac_n "checking for rl_pre_input_hook in -lreadline""... $ac_c" 1>&6
-echo "configure:7104: checking for rl_pre_input_hook in -lreadline" >&5
+echo "configure:7148: checking for rl_pre_input_hook in -lreadline" >&5
 ac_lib_var=`echo readline'_'rl_pre_input_hook | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -7108,7 +7152,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lreadline -ltermcap $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 7112 "configure"
+#line 7156 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -7119,7 +7163,7 @@ int main() {
 rl_pre_input_hook()
 ; return 0; }
 EOF
-if { (eval echo configure:7123: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7167: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -7145,7 +7189,7 @@ fi
 
 # check for readline 4.2
 echo $ac_n "checking for rl_completion_matches in -lreadline""... $ac_c" 1>&6
-echo "configure:7149: checking for rl_completion_matches in -lreadline" >&5
+echo "configure:7193: checking for rl_completion_matches in -lreadline" >&5
 ac_lib_var=`echo readline'_'rl_completion_matches | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -7153,7 +7197,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lreadline -ltermcap $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 7157 "configure"
+#line 7201 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -7164,7 +7208,7 @@ int main() {
 rl_completion_matches()
 ; return 0; }
 EOF
-if { (eval echo configure:7168: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7212: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -7189,7 +7233,7 @@ fi
 
 
 echo $ac_n "checking for broken nice()""... $ac_c" 1>&6
-echo "configure:7193: checking for broken nice()" >&5
+echo "configure:7237: checking for broken nice()" >&5
 if eval "test \"`echo '$''{'ac_cv_broken_nice'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7198,7 +7242,7 @@ if test "$cross_compiling" = yes; then
   ac_cv_broken_nice=no
 else
   cat > conftest.$ac_ext <<EOF
-#line 7202 "configure"
+#line 7246 "configure"
 #include "confdefs.h"
 
 int main()
@@ -7210,7 +7254,7 @@ int main()
 }
 
 EOF
-if { (eval echo configure:7214: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:7258: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_broken_nice=yes
 else
@@ -7241,12 +7285,12 @@ cat >> confdefs.h <<\EOF
 #endif
 EOF
 echo $ac_n "checking for socklen_t""... $ac_c" 1>&6
-echo "configure:7245: checking for socklen_t" >&5
+echo "configure:7289: checking for socklen_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_socklen_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 7250 "configure"
+#line 7294 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -7295,7 +7339,7 @@ done
 
 SRCDIRS="Parser Grammar Objects Python Modules"
 echo $ac_n "checking for build directories""... $ac_c" 1>&6
-echo "configure:7299: checking for build directories" >&5
+echo "configure:7343: checking for build directories" >&5
 for dir in $SRCDIRS; do
     if test ! -d $dir; then
         mkdir $dir
diff --git a/configure.in b/configure.in
index 9846dd2..108d239 100644
--- a/configure.in
+++ b/configure.in
@@ -968,7 +968,6 @@ then
 elif test "$ac_cv_pthread_is_default" = yes
 then
     AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     # Defining _REENTRANT on system with POSIX threads should not hurt.
     AC_DEFINE(_REENTRANT)
     posix_threads=yes
@@ -977,7 +976,6 @@ elif test "$ac_cv_kpthread" = "yes"
 then
     CC="$CC -Kpthread"
     AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     posix_threads=yes
     LIBOBJS="$LIBOBJS thread.o"
 else
@@ -987,6 +985,18 @@ else
     if test ! -z "$withval" -a -d "$withval"
     then LDFLAGS="$LDFLAGS -L$withval"
     fi
+
+    # According to the POSIX spec, a pthreads implementation must
+    # define _POSIX_THREADS in unistd.h. Some apparently don't (which ones?)
+    AC_MSG_CHECKING(for _POSIX_THREADS in unistd.h)
+    AC_EGREP_CPP(yes,
+    [#include <unistd.h>
+     #ifdef _POSIX_THREADS
+     yes
+     #endif
+    ], unistd_defines_pthreads=yes, unistd_defines_pthreads=no)
+    AC_MSG_RESULT($unistd_defines_pthreads)
+
     AC_DEFINE(_REENTRANT)
     AC_CHECK_HEADER(mach/cthreads.h, [AC_DEFINE(WITH_THREAD)
     AC_DEFINE(C_THREADS)
@@ -1013,47 +1023,32 @@ void * start_routine (void *arg) { exit (0); }], [
 pthread_create (NULL, NULL, start_routine, NULL)], [
     AC_MSG_RESULT(yes)
     AC_DEFINE(WITH_THREAD)
-    case $ac_sys_system in
-      Darwin*) ;;
-      *) AC_DEFINE(_POSIX_THREADS)
-         posix_threads=yes
-         ;;
-    esac
+    posix_threads=yes
     LIBOBJS="$LIBOBJS thread.o"],[
     LIBS=$_libs
     AC_CHECK_FUNC(pthread_detach, [AC_DEFINE(WITH_THREAD)
-    case $ac_sys_system in
-      Darwin*) ;;
-      *) AC_DEFINE(_POSIX_THREADS)
-         posix_threads=yes
-         ;;
-    esac
+    posix_threads=yes
     LIBOBJS="$LIBOBJS thread.o"],[
     AC_CHECK_HEADER(kernel/OS.h, [AC_DEFINE(WITH_THREAD)
     AC_DEFINE(BEOS_THREADS)
     LIBOBJS="$LIBOBJS thread.o"],[
     AC_CHECK_LIB(pthreads, pthread_create, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     posix_threads=yes
     LIBS="$LIBS -lpthreads"
     LIBOBJS="$LIBOBJS thread.o"], [
     AC_CHECK_LIB(c_r, pthread_create, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     posix_threads=yes
     LIBS="$LIBS -lc_r"
     LIBOBJS="$LIBOBJS thread.o"], [
     AC_CHECK_LIB(thread, __d6_pthread_create, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     posix_threads=yes
     LIBS="$LIBS -lthread"
     LIBOBJS="$LIBOBJS thread.o"], [
     AC_CHECK_LIB(pthread, __pthread_create_system, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     posix_threads=yes
     LIBS="$LIBS -lpthread"
     LIBOBJS="$LIBOBJS thread.o"], [
     AC_CHECK_LIB(cma, pthread_create, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_POSIX_THREADS)
     posix_threads=yes
     LIBS="$LIBS -lcma"
     LIBOBJS="$LIBOBJS thread.o"],[
@@ -1061,6 +1056,10 @@ pthread_create (NULL, NULL, start_routine, NULL)], [
     ])])])])])])])])])
 
     if test "$posix_threads" = "yes"; then
+      if test "$unistd_defines_pthreads" = "no"; then
+         AC_DEFINE(_POSIX_THREADS)
+      fi
+
       AC_MSG_CHECKING(if PTHREAD_SCOPE_SYSTEM is supported)
       AC_CACHE_VAL(ac_cv_pthread_system_supported,
       [AC_TRY_RUN([#include <pthread.h>
@@ -1082,6 +1081,7 @@ pthread_create (NULL, NULL, start_routine, NULL)], [
       if test "$ac_cv_pthread_system_supported" = "yes"; then
         AC_DEFINE(PTHREAD_SYSTEM_SCHED_SUPPORTED)
       fi
+      AC_CHECK_FUNCS(pthread_sigmask)
     fi
 
     AC_CHECK_LIB(mpc, usconfig, [AC_DEFINE(WITH_THREAD)
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 749666f..7057895 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -477,6 +477,9 @@
 /* Define if you have the pthread_init function.  */
 #undef HAVE_PTHREAD_INIT
 
+/* Define if you have the pthread_sigmask function.  */
+#undef HAVE_PTHREAD_SIGMASK
+
 /* Define if you have the putenv function.  */
 #undef HAVE_PUTENV