$NetBSD$

Honor CFLAGS and LDFLAGS from pkgsrc.

--- Makefile.orig	2010-01-17 21:16:18.000000000 +0000
+++ Makefile
@@ -1,7 +1,7 @@
-CFLAGS=-O3
+CFLAGS?=-O3
 
 pigz: pigz.o yarn.o
-	cc -o pigz pigz.o yarn.o -lpthread -lz
+	cc ${LDFLAGS} -o pigz pigz.o yarn.o -lpthread -lz
 	ln -f pigz unpigz
 
 pigz.o: pigz.c yarn.h
