From 8f303505eada73f6c70ae19b98b3ac44e0cf0480 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 3 Oct 2007 17:40:12 -0700
Subject: [PATCH] Use autoconf to request feature macros

---
 compiler.h   | 8 --------
 configure.in | 6 ++++--
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/compiler.h b/compiler.h
index 0f7261c8..5f35490e 100644
--- a/compiler.h
+++ b/compiler.h
@@ -24,14 +24,6 @@
 # include "config.h"
 #endif
 
-/* Request as many features as we can */
-#define _GNU_SOURCE
-#define _ISO99_SOURCE
-#define _POSIX_SOURCE
-#define _POSIX_C_SOURCE		200112L
-#define _XOPEN_SOURCE		600
-#define _XOPEN_SOURCE_EXTENDED
-
 #ifdef __GNUC__
 # if __GNUC__ >= 4
 #  define HAVE_GNUC_4
diff --git a/configure.in b/configure.in
index 009720a2..c43d39ca 100644
--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,6 @@
-dnl Process this file with autoconf 2.53 or later to produce
+dnl Process this file with autoconf 2.59 or later to produce
 dnl a configure script.
-AC_PREREQ(2.53)
+AC_PREREQ(2.59)
 AC_INIT(config.h.in)
 AC_CONFIG_HEADERS(config.h)
 
@@ -47,6 +47,8 @@ fi
 AC_PREFIX_PROGRAM(nasm)
 
 dnl Checks for programs.
+AC_USE_SYSTEM_EXTENSIONS
+AC_ISC_POSIX
 AC_PROG_CC
 AC_PROG_LN_S
 AC_PROG_MAKE_SET