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diff --git a/m4/aclocal_cxx.m4 b/m4/aclocal_cxx.m4
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+dnl -------------------------------------------------------------------------
+dnl -------------------------------------------------------------------------
+dnl
+dnl Copyright by the Board of Trustees of the University of Illinois.
+dnl All rights reserved.
+dnl
+dnl This file is part of HDF5.  The full HDF5 copyright notice, including
+dnl terms governing use, modification, and redistribution, is contained in
+dnl the files COPYING and Copyright.html.  COPYING can be found at the root
+dnl of the source code distribution tree; Copyright.html can be found at the
+dnl root level of an installed copy of the electronic HDF5 document set and
+dnl is linked from the top-level documents page.  It can also be found at
+dnl http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have
+dnl access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu.
+dnl
+dnl -------------------------------------------------------------------------
+dnl -------------------------------------------------------------------------
+
+dnl *********************************
+dnl PURPOSE
+dnl  Contains Macros for HDF5 C++
+dnl *********************************
+dnl
+dnl Special characteristics that have no autoconf counterpart but that
+dnl we need as part of the C++ support.  To distinquish these, they
+dnl have a [PAC] prefix.
+
+dnl Checking if C++ needs old style header files in includes
+
+AC_DEFUN([PAC_PROG_CXX_HEADERS],[
+  AC_MSG_CHECKING([if $CXX needs old style header files in includes])
+  AC_LINK_IFELSE([AC_LANG_SOURCE([
+#include <iostream>
+
+int main(void) { return 0; }
+  ])],
+    [AC_MSG_RESULT([no])],
+    [AC_MSG_RESULT([yes])
+    CXXFLAGS="${CXXFLAGS} -DOLD_HEADER_FILENAME"
+    AM_CXXFLAGS="${AM_CXXFLAGS} -DOLD_HEADER_FILENAME"])
+])
+
+dnl Checking if ++ can handle namespaces
+
+AC_DEFUN([PAC_PROG_CXX_NAMESPACE],[
+  AC_MSG_CHECKING([if $CXX can handle namespaces])
+  AC_LINK_IFELSE([AC_LANG_SOURCE([
+namespace H5 {
+int fnord;
+}
+
+int main(void) {
+   using namespace H5;
+   fnord = 37;
+   return 0;
+} 
+  ])], [AC_MSG_RESULT([yes])],
+     [AC_MSG_RESULT([no])
+     CXXFLAGS="${CXXFLAGS} -DH5_NO_NAMESPACE"
+     AM_CXXFLAGS="${AM_CXXFLAGS} -DH5_NO_NAMESPACE"])
+])
+
+dnl Checking if C++ supports std
+
+AC_DEFUN([PAC_PROG_CXX_STD],[
+  AC_MSG_CHECKING([if $CXX supports std])
+  AC_LINK_IFELSE([AC_LANG_SOURCE([
+#include <string>
+
+using namespace std;
+
+int main(void) {
+   string myString("testing namespace std");
+   return 0;
+}
+  ])], [AC_MSG_RESULT([yes])],
+     [AC_MSG_RESULT([no])
+     CXXFLAGS="${CXXFLAGS} -DH5_NO_STD"
+     AM_CXXFLAGS="${AM_CXXFLAGS} -DH5_NO_STD"])
+])
+
+dnl Checking if C++ has offsetof extension
+
+AC_DEFUN([PAC_PROG_CXX_OFFSETOF],[
+  AC_MSG_CHECKING([if $CXX has offsetof extension])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([
+  #include <stdio.h>
+  #include <stddef.h>
+    ],[
+    struct index_st
+    {
+      unsigned char type;
+      unsigned char num;
+      unsigned int len;
+    };
+    typedef struct index_st index_t;
+    int x,y;
+    x = offsetof(struct index_st, len);
+    y = offsetof(index_t, num)
+    ])],[AC_MSG_RESULT([yes])
+    AC_DEFINE([CXX_HAVE_OFFSETOF], [1], [Define if C++ compiler recognizes offsetof])],
+    AC_MSG_RESULT([no]))
+])
+
+dnl Checking if C++ can handle static cast
+
+AC_DEFUN([PAC_PROG_CXX_STATIC_CAST],[
+  AC_MSG_CHECKING([if $CXX can handle static cast])
+  AC_LINK_IFELSE([AC_LANG_SOURCE([
+int main(void) {
+   float test_float;
+   int test_int;
+   test_float = 37.0;
+   test_int = static_cast <int> (test_float);
+   return 0;
+}
+  ])], [AC_MSG_RESULT([yes])],
+    [AC_MSG_RESULT([no])
+    CXXFLAGS="${CXXFLAGS} -DNO_STATIC_CAST"
+    AM_CXXFLAGS="${AM_CXXFLAGS} -DNO_STATIC_CAST"])
+])