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=f2acd45eae3697c798716e6b99c32565babbf70f'>root</a>/<a href='/guix/log/tests?id=f2acd45eae3697c798716e6b99c32565babbf70f'>tests</a>/<a href='/guix/log/tests/status.scm?id=f2acd45eae3697c798716e6b99c32565babbf70f'>status.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/status.scm?id=f2acd45eae3697c798716e6b99c32565babbf70f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-02-05 12:03:25 +0100'>2019-02-05</span></td><td><a href='/guix/commit/tests/status.scm?id=ba514b601ba6be15b823e0a12d4b6e42f9d2489e'>status: Keep track of the current build phase.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/status.scm (&lt;build&gt;)[phase]: New field.
(%phase-start-rx): New variable.
(update-build): Add clause to match %PHASE-START-RX and adjust the
'phase' field accordingly.
* tests/status.scm ("compute-status, build phase"): Add test
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-29 12:09:52 +0100'>2019-01-29</span></td><td><a href='/guix/commit/tests/status.scm?id=73a8681a16869a2b3a9da1c7ba9434e07a204e19'>status: Keep track of build completion as reported by build tools.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/status.scm (&lt;build&gt;)[completion]: New field.
(build): Add #:completion parameter.
(%percentage-line-rx, %fraction-line-rx): New variables.
(update-build): New procedure.
(compute-status): Add 'build-log' case.
* tests/status.scm ("compute-status, build completion"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-29 12:09:52 +0100'>2019-01-29</span></td><td><a href='/guix/commit/tests/status.scm?id=976ef2d97887d16eab8d4eb9dad811786b04d690'>status: Record more information about builds.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/status.scm (&lt;build&gt;): New record type.
(build, matching-build): New procedures.
(compute-status): Adjust to manipulate &lt;build&gt; records instead of
derivation file names in 'build-status-builds-completed' and
'build-status-building'.
(build-event-output-port)[process-line]: Use 'string-split' to preserve
spaces.
* tests/status.scm ("compute-status, builds + substitutes")
("compute-status, missing events"): Adjust to expect &lt;build&gt; records.
Produce complete "build-started" events.
("compute-status, multiplexed build output"): Likewise, and remove
"bar.drv" from 'builds-completed'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-09 14:47:53 +0100'>2019-01-09</span></td><td><a href='/guix/commit/tests/status.scm?id=a65177a657b0cb36d45f2e8db574ea9c10f89a1f'>maint: Remove 'cond-expand' forms for Guile 2.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>Note: Leave 'cond-expand' forms used in the build-side modules that can
run on %BOOTSTRAP-GUILE, which is currently Guile 2.0.

* guix/build/compile.scm: Move 'use-modules' clause from 'cond-expand'
to 'define-module' form.
(%default-optimizations): Remove 'cond-expand'.
* guix/build/download.scm (tls-wrap): Remove 'cond-expand'.
* guix/build/syscalls.scm: Remove 'cond-expand' form around
'%set-automatic-finalization-enabled?!' and
'without-automatic-finalization'.
* guix/inferior.scm (port-&gt;inferior): Remove 'cond-expand'.
* guix/scripts/pack.scm (wrapped-package)[build]: Remove 'cond-expand'.
* guix/status.scm (build-event-output-port): Remove 'cond-expand'.
* guix/store.scm (open-inet-socket): Remove 'cond-expand'.
* guix/ui.scm (install-locale): Remove 'cond-expand'.
* tests/status.scm ("current-build-output-port, UTF-8 + garbage"):
Remove 'cond-expand'.
* tests/store.scm ("current-build-output-port, UTF-8 + garbage"):
Remove 'cond-expand'.
</span></span></td><td>Ludovic Courtès</td></tr>