--- ./Makefile.orig	2012-06-16 16:54:07.000000000 +1000
+++ ./Makefile	2012-06-16 16:54:52.000000000 +1000
@@ -2,7 +2,7 @@
 # $Id: Makefile,v 1.7 2011-11-15 18:55:19 gray Exp $
 #
 
-CC	= cc
+CC	?= cc
 
 PROG	= sortu
 OBJS	= sortu.o argv.o strsep.o table.o
@@ -10,8 +10,8 @@
 PORTFLS	= README.txt LICENSE.txt Makefile ChangeLog test_sortu.sh \
 	sortu.c strsep.[ch] argv.[ch] argv_loc.h table.[ch] table_loc.h
 
-CFLAGS	= -g -Wall -O2 $(CCFLS)
-DESTDIR	= /usr/local/sbin
+CFLAGS	?= -g -Wall -O2 $(CCFLS)
+DESTDIR	?= /usr/local/sbin
 
 all : $(PROG)