- Modifications to compile ImageMagick

ImageMagick/m4/ax_cxx_namespaces.m4

@@ -0,0 +1,40 @@
+# ===========================================================================
+#     http://www.gnu.org/software/autoconf-archive/ax_cxx_namespaces.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_NAMESPACES
+#
+# DESCRIPTION
+#
+#   If the compiler can prevent names clashes using namespaces, define
+#   HAVE_NAMESPACES.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Todd Veldhuizen
+#   Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 6
+
+AU_ALIAS([AC_CXX_NAMESPACES], [AX_CXX_NAMESPACES])
+AC_DEFUN([AX_CXX_NAMESPACES],
+[AC_CACHE_CHECK(whether the compiler implements namespaces,
+ax_cv_cxx_namespaces,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE([namespace Outer { namespace Inner { int i = 0; }}],
+                [using namespace Outer::Inner; return i;],
+ ax_cv_cxx_namespaces=yes, ax_cv_cxx_namespaces=no)
+ AC_LANG_RESTORE
+])
+if test "$ax_cv_cxx_namespaces" = yes; then
+  AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
+fi
+])