--- gforth/configure.in	2008/10/06 20:59:17	1.245
+++ gforth/configure.in	2008/10/10 21:20:44	1.248
@@ -669,6 +669,17 @@ case "$host_os" in
                 #http://mail.python.org/pipermail/pythonmac-sig/2005-October/015190.html
                 AC_DEFINE_UNQUOTED(MACOSX_DEPLOYMENT_TARGET,"10.3",[an environment variable value needed by libtool on some MacOS X versions])
 		;;
+	*linux*)
+		DIRSEP="/"
+		PATHSEP=":"
+		DEFAULTSYSTEMPREFIX=""
+		if test "$wordsize" = 64; then
+		   LTDL_LIBRARY_PATH=`ldconfig -p |tail -n +2 |sed 's/^.* => //'|sed 's|/[[^/]]*$||'| grep 64 | sort -u | tr '[\n]' [:] | sed -e 's/:$//'`
+                   if test -n "$LTDL_LIBRARY_PATH"; then
+                      AC_DEFINE_UNQUOTED(LTDL_LIBRARY_PATH,"$LTDL_LIBRARY_PATH",[Define LTDL_LIBRARY_PATH for 64 bit Linux])
+                   fi                                                                
+		fi
+		;;
 	*)
 		DIRSEP="/"
 		PATHSEP=":"