--- ./makefile.orig	1998-07-31 06:41:20.000000000 +0200
+++ ./makefile	2013-12-24 08:28:45.000000000 +0100
@@ -9,14 +9,16 @@
 
 # Makefile user-definable variables------------------------------------------
 
-CC=gcc
+CC?=${CC}
+PREFIX?=${PREFIX}
+LOCALBASE?=${PREFIX}
 MATHLIB=-lm
 
 INSTALLROOT=$(PREFIX)
 LANGUAGE=english
 
-XLIB=-L$(PREFIX)/lib -lX11 #-lcompat
-CFLAGS=-I$(PREFIX)/include -O2
+XLIB=-L$(LOCALBASE)/lib -lX11 #-lcompat
+CFLAGS+=-I$(LOCALBASE)/include
 
 
 # End of makefile user-definable variables-----------------------------------