--- Makefile.orig	2009-03-15 13:11:12.000000000 +0300
+++ Makefile	2014-11-30 07:39:48.000000000 +0300
@@ -6,10 +6,10 @@
 # February 25, 2009 - March 15, 2009
 
 VERSION=0.5
-CC=gcc
+CC?=gcc
 SDL_CFLAGS=$(shell sdl-config --cflags)
 SDL_LIBS=$(shell sdl-config --libs) -lSDL_image
-CFLAGS=-Wall -O2 $(SDL_CFLAGS) -DVERSION="\"${VERSION}\""
+CFLAGS+=-Wall $(SDL_CFLAGS) -DVERSION="\"${VERSION}\""
 
 all:	fop