--- Makefile.orig	2002-11-03 10:42:31.000000000 +1100
+++ Makefile	2011-04-04 05:54:46.000000000 +1000
@@ -1,10 +1,10 @@
-PREFIX = /usr/local
+PREFIX ?= /usr/local
 VERSION = 1.1
 
-CC = cc
-CFLAGS = -g -Wall 
-LD = cc
-LDFLAGS = -framework ApplicationServices
+CC ?= cc
+CFLAGS += -g -Wall 
+LD ?= cc
+LDFLAGS += -framework ApplicationServices
 RM = /bin/rm -f
 SRC = Makefile pict2pdf.c
 DOC = README