--- Makefile.orig	2008-11-03 07:25:21.000000000 +0100
+++ Makefile	2009-05-04 21:58:03.000000000 +0200
@@ -59,7 +59,7 @@
 OPT = $(POPT)
 endif
 INCLUDE = -Iinclude
-CFLAGS = $(OPT) $(WARN) $(INCLUDE) $(CFLAGS.EXTRA)
+CFLAGS += $(OPT) $(WARN) $(INCLUDE) $(CFLAGS.EXTRA)
 
 LIB.SRCS = src/glew.c
 LIB.OBJS = $(LIB.SRCS:.c=.o)