From e763c28e9aabc10660f5085e6af69de80ab71c9a Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Thu, 30 Jan 2014 23:26:27 +0100
Subject: mention IUCLC being a GNU extension

---
 hurd/porting/guidelines.mdwn | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'hurd/porting')

diff --git a/hurd/porting/guidelines.mdwn b/hurd/porting/guidelines.mdwn
index d28a777e..e029744d 100644
--- a/hurd/porting/guidelines.mdwn
+++ b/hurd/porting/guidelines.mdwn
@@ -317,6 +317,10 @@ Use <sys/cdrom.h> instead.
 
 This is not actually standard; cfsetspeed, cfsetispeed, or cfsetospeed should be used instead.
 
+## <a name="termios"> IUCLC </a>
+
+IUCLC is a GNU extension. `#define _GNU_SOURCE' thus has to be used to get the definition (even if Linux unconditionally provides it, it should not).
+
 ## <a name="errno"> `errno` values </a>
 
 When dealing with `errno`, you should always use the predefined error codes defined with the `E*` constants, instead of manually comparing/assigning/etc with their values.
-- 
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