--- Makefile.orig	Sat Sep  2 17:41:34 2000
+++ Makefile	Sat Sep  2 17:41:48 2000
@@ -3,11 +3,12 @@
 # (c) <lcamtuf@tpi.pl>
 #
 
-CC      = gcc
+CC      ?= gcc
 CLIBS	= -lpcap
 SUNLIBS	= -lsocket -lnsl -D_SUN_=1
 STRIP	= strip
-CFLAGS  = -O3 -Wall
+CFLAGS  ?= -O3
+CFLAGS	+= -Wall
 FILE	= p0f
 VERSION = 1.7