$NetBSD: patch-Makefile,v 1.5 2016/10/02 09:06:11 fhajny Exp $

Do not mess with the build ENV.

--- Makefile.orig	2016-05-30 05:09:41.000000000 +0000
+++ Makefile
@@ -1,7 +1,6 @@
 CC=cc
-CFLAGS=-O3 -Wall -Wextra
-LDFLAGS=
-LIBS=-lm -lpthread -lz
+CFLAGS+=-O3 -Wall -Wextra
+LIBS+=-lm -lpthread -lz
 ZOPFLI=zopfli/src/zopfli/
 # use gcc and gmake on Solaris
 
