From 7329a4f038ed096f3cfa11cb60433f44009fbe16 Mon Sep 17 00:00:00 2001
From: Jason Evans <jasone@canonware.com>
Date: Tue, 22 Jan 2013 10:53:29 -0800
Subject: Fix AC_PATH_PROG() calls to specify default.

Fix AC_PATH_PROG() calls to specify 'false' as the default, so that if
the configure script fails to find a program, the false program is
instead called, and an error occurs.  Prior to this fix, if xsltproc
could not be found, make would not report an error due to the leading -o
in the xsltproc invocation.

Reported by David Reiss.
---
 configure.ac | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index aee7482..8c13082 100644
--- a/configure.ac
+++ b/configure.ac
@@ -86,7 +86,7 @@ MANDIR=`eval echo $MANDIR`
 AC_SUBST([MANDIR])
 
 dnl Support for building documentation.
-AC_PATH_PROG([XSLTPROC], [xsltproc], , [$PATH])
+AC_PATH_PROG([XSLTPROC], [xsltproc], [false], [$PATH])
 if test -d "/usr/share/xml/docbook/stylesheet/docbook-xsl" ; then
   DEFAULT_XSLROOT="/usr/share/xml/docbook/stylesheet/docbook-xsl"
 elif test -d "/usr/share/sgml/docbook/xsl-stylesheets" ; then
@@ -403,9 +403,9 @@ AC_SUBST([enable_autogen])
 
 AC_PROG_INSTALL
 AC_PROG_RANLIB
-AC_PATH_PROG([AR], [ar], , [$PATH])
-AC_PATH_PROG([LD], [ld], , [$PATH])
-AC_PATH_PROG([AUTOCONF], [autoconf], , [$PATH])
+AC_PATH_PROG([AR], [ar], [false], [$PATH])
+AC_PATH_PROG([LD], [ld], [false], [$PATH])
+AC_PATH_PROG([AUTOCONF], [autoconf], [false], [$PATH])
 
 public_syms="malloc_conf malloc_message malloc calloc posix_memalign aligned_alloc realloc free malloc_usable_size malloc_stats_print mallctl mallctlnametomib mallctlbymib"
 
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