--- sptunnel/Makefile.orig	2009-12-13 10:02:35.000000000 +0800
+++ sptunnel/Makefile	2013-09-08 21:02:59.000000000 +0800
@@ -1,9 +1,8 @@
 
 #--------------------------------------------------------------------
 
-CC = gcc
 AR = ar cru
-CFLAGS = -Wall -D_REENTRANT -D_GNU_SOURCE -g -fPIC
+CFLAGS += -Wall -D_REENTRANT -D_GNU_SOURCE -g -fPIC
 SOFLAGS = -shared
 LDFLAGS = -lstdc++ -lpthread -lresolv