$NetBSD: patch-aa,v 1.2 2009/10/27 15:29:33 taca Exp $

--- extconf.rb.orig	2002-03-21 03:09:14.000000000 +0900
+++ extconf.rb
@@ -7,6 +7,8 @@
 
 require "mkmf"
 
+have_header("unistd.h")
+
 have_header("linux/quota.h")       # for linux
 have_header("linux/types.h")
 have_header("sys/quota.h")
@@ -16,5 +18,6 @@ have_header("sys/fs/ufs_quota.h")  # for
 
 have_header("ufs/ufs/quota.h")     # for *bsd
 have_header("sys/ucred.h")         # required by FreeBSD and NetBSD
+have_header("sys/statvfs.h")       # required by NetBSD
 
 create_makefile("quota")