See https://bugs.freedesktop.org/show_bug.cgi?id=47792;
should become obsolete with the next release.

diff -u luit-1.1.1.orig/sys.c luit-1.1.1/sys.c
--- luit-1.1.1.orig/sys.c	2012-03-23 05:23:07.000000000 +0100
+++ luit-1.1.1/sys.c	2013-11-27 22:45:53.000000000 +0100
@@ -20,6 +20,8 @@
 THE SOFTWARE.
 */
 
+#define _XOPEN_SOURCE 600
+
 #ifdef HAVE_CONFIG_H
 # include "config.h"
 #endif
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<tr><td><span title='2017-08-24 23:55:51 +0200'>2017-08-24</span></td><td><a href='/guix/commit/tests?id=94e86a6b67c7a02f5f11358743f3b9f11997059c'>graft: Correctly replace references near the end of the scan buffer.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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<tr><td><span title='2017-06-22 10:59:07 +0200'>2017-06-22</span></td><td><a href='/guix/commit/tests?id=1071f781d97509347144754b3248581cf7c6c1d5'>daemon: '--listen' can be passed several times, can specify TCP endpoints.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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