$NetBSD: patch-aa,v 1.1.1.1 2008/04/17 12:33:56 reed Exp $

--- Makefile.orig	2007-05-21 15:50:37.000000000 -0500
+++ Makefile	2008-04-14 15:30:47.000000000 -0500
@@ -19,10 +19,14 @@
 INSTALL = install
 GROFF   = groff
 
+ifndef DESTDIR
 DESTDIR = /usr/local
+endif
 PREFIX  =
 BINDIR  = $(PREFIX)/bin
+ifndef MANDIR
 MANDIR  = $(PREFIX)/share/man
+endif
 MAN1DIR = $(MANDIR)/man1
 
 ifeq ($(UNAME_S),FreeBSD)