--- Makefile.orig	Sun May 16 21:55:26 1999
+++ Makefile	Sun May 16 21:55:46 1999
@@ -13,12 +13,13 @@
 #
 
 # Generic compiler
-CC = cc
+CC ?= cc
 # GNU..
 #CC = gcc 
 
 # Normal systems flags
-CFLAGS = -O -Wall
+CFLAGS ?= -O -Wall
+CFLAGS += -DPREFIX=\"${PREFIX}\"
 
 # Debug mode for portsentry
 #CFLAGS = -Wall -g -DNODAEMON -DDEBUG