--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/config/gxx-include-dir.m4	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,32 @@
+dnl Usage: TL_AC_GXX_INCLUDE_DIR
+dnl
+dnl Set $gxx_include_dir to the location of the installed C++ include
+dnl directory.  The value depends on $gcc_version and the configuration
+dnl options --with-gxx-include-dir and --enable-version-specific-runtime-libs.
+dnl
+dnl If you change the default here, you'll need to change the gcc and
+dnl libstdc++-v3 subdirectories too.
+AC_DEFUN([TL_AC_GXX_INCLUDE_DIR],
+[
+case "${with_gxx_include_dir}" in
+  yes)
+    AC_MSG_ERROR([--with-gxx-include-dir=[[dir]] requires a directory])
+    ;;
+  no | "")
+    case "${enable_version_specific_runtime_libs}" in
+      yes) gxx_include_dir='$(libsubdir)/include/c++' ;;
+      *)
+	libstdcxx_incdir='c++/$(gcc_version)'
+	gxx_include_dir='include/$(libstdcxx_incdir)'
+	if test -n "$with_cross_host" && 
+           test x"$with_cross_host" != x"no"; then	
+          gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
+        else
+          gxx_include_dir='${prefix}/'"$gxx_include_dir"
+        fi;;
+    esac ;;
+  *) gxx_include_dir=${with_gxx_include_dir} ;;
+esac
+AC_SUBST(gxx_include_dir)
+AC_SUBST(libstdcxx_incdir)
+])