--- Makefile.orig	2013-09-20 03:13:32.533531973 +0800
+++ Makefile	2013-09-20 03:13:40.954532152 +0800
@@ -5,7 +5,7 @@
 # http://miniupnp.free.fr/libnatpmp.html
 
 OS = $(shell uname -s)
-CC = gcc
+CC ?= gcc
 INSTALL = install
 
 # APIVERSION is used in soname
