diff --git a/glslUtil/SConstruct b/glslUtil/SConstruct
index cef95c3..7be3e6c 100644
--- a/glslUtil/SConstruct
+++ b/glslUtil/SConstruct
@@ -1,4 +1,4 @@
 # vim:filetype=python
 
-env = Environment()
+env = Environment(CFLAGS = ['-Wall'], CPPFLAGS = ['-DGL_GLEXT_PROTOTYPES'])
 env.Object('glslUtil.o', 'glslUtil.c')