--- simscan-1.4.0-r4/configure.in	2009-12-30 18:43:21.319106305 +0100
+++ simscan-1.4.0-r4/configure.in	2009-12-30 18:43:44.496705293 +0100
@@ -11,8 +11,8 @@ 
 
 if test "$GCC"="yes"
 then
-         CXXFLAGS="$CXXFLAGS -Wall"
-         CFLAGS="$CFLAGS -Wall"
+         CXXFLAGS+= -Wall
+         CFLAGS+= -Wall
 fi
 
 #----------------------------------------------------------------------