--- Makefile.org	Thu Jan 17 18:42:50 2002
+++ Makefile	Sat May 11 20:22:31 2002
@@ -104,14 +104,14 @@
 		done
 
 mex_config:	
-		if [ ! -f src/mex/makefile ]; then \
+		if [ -d src/mex -a ! -f src/mex/makefile ]; then \
 			cd src/mex; \
 			\rm -f config.{cache,log,status}; \
 			./configure; \
 		fi
 		
 xgrid_config:	
-		if [ ! -f src/xgrid/makefile ]; then \
+		if [ -d src/xgrid -a ! -f src/xgrid/makefile ]; then \
 			cd src/xgrid; \
 			\rm -f config.{cache,log,status}; \
 			./configure; \