--- gforth/configure.in	2008/10/09 21:13:49	1.247
+++ gforth/configure.in	2008/10/11 18:42:08	1.249
@@ -675,7 +675,9 @@ case "$host_os" in
 		DEFAULTSYSTEMPREFIX=""
 		if test "$wordsize" = 64; then
 		   LTDL_LIBRARY_PATH=`grep 64 /etc/ld.so.conf | tr '[\n]' [:] | sed -e 's/:$//'`
-		   AC_DEFINE_UNQUOTED(LTDL_LIBRARY_PATH,"$LTDL_LIBRARY_PATH",[Define LTDL_LIBRARY_PATH for 64 bit Linux])
+		   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
 		;;
 	*)