--- Makefile.osx.orig	2012-01-24 21:33:22.000000000 +0100
+++ Makefile.osx	2014-02-24 15:57:22.575172070 +0100
@@ -1,7 +1,7 @@
 
-CC=gcc
+CC?=gcc
 
-CFLAGS=-c -Wall -O3 -fno-strict-aliasing -DOSX
+CFLAGS+=-c -DOSX
 LDFLAGS=-lm
 
 SOURCES=prober.c tcp_client.c tcpserver.c wrappers.c tbdetect.c measflow.c