diff --git a/Source/Makefile.in b/Source/Makefile.in
index 9daeac0ca1..43c308a48d 100644
--- a/Source/Makefile.in
+++ b/Source/Makefile.in
@@ -52,5 +52,5 @@ cmSourceGroup.o : $(DEPENDS)
 
 
 cmake: ${OBJS}
-	${CXX} ${OBJS} ${CXX_FLAGS}  -o cmake
+	${CXX} ${OBJS} ${CXXFLAGS}  -o cmake