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--- zip30.orig/unix/Makefile 2008-05-07 08:33:56.000000000 +0200
+++ zip30/unix/Makefile 2016-04-07 22:55:11.000000000 +0200
@@ -22,7 +22,7 @@ SHELL = /bin/sh
LN = ln -s
# (to use the GNU compiler, change cc to gcc in CC)
-CC = cc
+CC ?= cc
BIND = $(CC)
AS = $(CC) -c
CPP = /lib/cpp
@@ -58,7 +58,7 @@ IZ_OUR_BZIP2_DIR = bzip2
# LFLAGS1 flags after output file spec, before obj file list
# LFLAGS2 flags after obj file list (libraries, etc)
CFLAGS_NOOPT = -I. -DUNIX $(LOCAL_ZIP)
-CFLAGS = -O2 $(CFLAGS_NOOPT)
+CFLAGS ?= -O2 $(CFLAGS_NOOPT)
LFLAGS1 =
LFLAGS2 = -s
@@ -202,7 +202,7 @@ generic: flags
eval $(MAKE) $(MAKEF) zips `cat flags`
generic_gcc:
- $(MAKE) $(MAKEF) generic CC=gcc CPP="gcc -E"
+ $(MAKE) $(MAKEF) generic CPP="gcc -E" CC="$(CC)"
# AT&T 6300 PLUS (don't know yet how to allocate 64K bytes):
att6300nodir:
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