--- Makefile.orig	2022-10-05 19:07:09
+++ Makefile	2022-10-05 19:08:40
@@ -4,8 +4,12 @@
 VERSION = 1.3
 
 # paths
-PREFIX = /usr/local
+PREFIX = __PREFIX__
 MANPREFIX = ${PREFIX}/share/man
+
+CC      = __CC__
+CFLAGS  = __CFLAGS__
+LDFLAGS = __LDFLAGS__
 
 # use system flags.
 SIC_CFLAGS = ${CFLAGS}