$NetBSD: patch-Makefile,v 1.6 2018/01/02 09:24:08 fhajny Exp $

Do not mess with the build ENV.

--- Makefile.orig	2017-12-27 00:35:01.000000000 +0000
+++ Makefile
@@ -1,7 +1,6 @@
 CC=gcc
-CFLAGS=-O3 -Wall -Wextra -Wno-unknown-pragmas
-LDFLAGS=
-LIBS=-lm -lpthread -lz
+CFLAGS+=-O3 -Wall -Wextra -Wno-unknown-pragmas
+LIBS+=-lm -lpthread -lz
 ZOPFLI=zopfli/src/zopfli/
 ZOP=deflate.o blocksplitter.o tree.o lz77.o cache.o hash.o util.o squeeze.o katajainen.o
 
