$NetBSD: patch-ab,v 1.3 2015/04/13 11:33:35 fhajny Exp $

Add DESTDIR support.
--- src/Makefile.orig	2015-04-01 14:01:44.000000000 +0000
+++ src/Makefile
@@ -23,8 +23,8 @@ WARN=-Wall -W
 OPT=$(OPTIMIZATION)
 
 PREFIX?=/usr/local
-INSTALL_BIN=$(PREFIX)/bin
-INSTALL=install
+INSTALL_BIN=$(DESTDIR)$(PREFIX)/bin
+INSTALL=$(BSD_INSTALL_PROGRAM)
 
 # Default allocator
 ifeq ($(uname_S),Linux)