--- unix/Makefile.orig	Mon Nov 29 14:22:42 1999
+++ unix/Makefile	Tue Feb 15 21:41:55 2000
@@ -17,7 +17,7 @@
 LN = ln -s
 
 # (to use the Gnu compiler, change cc to gcc in CC)
-CC = cc
+CC ?= cc
 BIND = $(CC)
 AS = $(CC) -c
 E =
@@ -45,7 +45,7 @@
 #   CFLAGS    flags for C compile
 #   LFLAGS1   flags after output file spec, before obj file list
 #   LFLAGS2   flags after obj file list (libraries, etc)
-CFLAGS = -O2 -I. -DUNIX $(LOCAL_ZIP)
+CFLAGS += -I. -DUNIX $(LOCAL_ZIP)
 LFLAGS1 =
 LFLAGS2 = -s