--- Makefile.orig	Wed May 28 10:54:27 2014
+++ Makefile	Wed May 28 11:01:43 2014
@@ -3,7 +3,8 @@
 VERS	:= 1.1
 
 CC	= cc
-CFLAGS	= -O2 -Wall -Wunused -Wmissing-prototypes -Wstrict-prototypes
+CFLAGS	?= -O2 -Wall
+CFLAGS	+= -Wunused -Wmissing-prototypes -Wstrict-prototypes
 #CFLAGS += -g
 INCLUDES = -I/usr/X11R6/include