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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<div class='path'>path: <a href='/guix/log/?id=4dfdd822102690b5687acf28365ab707b68d9476'>root</a>/<a href='/guix/log/tests?id=4dfdd822102690b5687acf28365ab707b68d9476'>tests</a>/<a href='/guix/log/tests/lint.scm?id=4dfdd822102690b5687acf28365ab707b68d9476'>lint.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/lint.scm?id=4dfdd822102690b5687acf28365ab707b68d9476&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-05-06 17:12:45 +0200'>2023-05-06</span></td><td><a href='/guix/commit/tests/lint.scm?id=71fd35c1d55988c413a37c7d15006b4d38d7dde7'>lint: archival: Warn against non-origin package sources.</a><span class='msg-avail'>...<span class='msg-tooltip'>Suggested by Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
and Simon Tournier &lt;zimon.toutoune@gmail.com&gt;.

* guix/lint.scm (check-archival): Add 'local-file?' clause.  Clarify
message in case (package-source package) is not an origin.
* tests/lint.scm ("archival: not an origin"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-10-27 19:43:06 +0200'>2022-10-27</span></td><td><a href='/guix/commit/tests/lint.scm?id=c485a9d8af210425a0435280fff8588563e49684'>gnu: python-setuptools: Move to python-build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/python-xyz.scm (python-setuptools): Move…
* gnu/packages/python-build.scm: …here.
* gnu/packages/chemistry.scm,
gnu/packages/messaging.scm,
gnu/packages/sequoia.scm,
tests/lint.scm: Adjust module imports accordingly.

Co-authored-by: Marius Bakke &lt;marius@gnu.org&gt;
</span></span></td><td>Lars-Dominik Braun</td></tr>
<tr><td><span title='2022-10-17 23:15:08 +0200'>2022-10-17</span></td><td><a href='/guix/commit/tests/lint.scm?id=2383e145185efb2e6f99931707ec93d65d166432'>lint: source: Add check for &lt;svn-reference&gt; over HTTP(S).</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/lint.scm (svn-reference-uri-with-userinfo): New procedure.
(check-source): Add 'svn-reference?' clause.
* tests/lint.scm ("source: svn-reference, HTTP 200")
("source: svn-reference, HTTP 404"): New tests.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-03-29 14:43:14 +0300'>2022-03-29</span></td><td><a href='/guix/commit/tests/lint.scm?id=67213a27592122e05c196c490de2ddf990d6832a'>download: Use https for main KDE source.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/download.scm (%mirrors)[kde]: Use https URIs for main KDE mirrors.
* tests/lint.scm ("mirror-url: kde suggestion"): New test.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-03-11 23:34:47 -0500'>2022-03-11</span></td><td><a href='/guix/commit/tests/lint.scm?id=88e44f7e1615579cee27a08bcde31248e65c1178'>lint: check-tests-true: Allow #:tests? #t for some build systems.</a><span class='msg-avail'>...<span class='msg-tooltip'>emacs-build-system sets #:tests? #f by default, so the linter shouldn't warn
if #:tests? #t is set for packages using emacs-build-system.  Likewise for
texlive-build-system.

* guix/lint.scm (check-tests-true): Do not warn if the build system
  is emacs-build-system or texlive-build-system.
* tests/lint.scm
  ("tests-true: #:tests? #t acceptable for emacs packages")
  ("tests-true: #:tests? #t acceptable for texlive packages"): New tests.

Fixes: &lt;https://issues.guix.gnu.org/50299&gt;
Reported-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Maxime Devos</td></tr>