This fixes a bug with the libevent backend on 32-bit platforms:

  https://github.com/wingo/fibers/issues/86

diff --git a/extensions/libevent.c b/extensions/libevent.c
index 4f44de9..52c9d73 100644
--- a/extensions/libevent.c
+++ b/extensions/libevent.c
@@ -215,7 +215,8 @@ run_event_loop (void *p)
     microsec = -1;
   else if (data->timeout >= 0)
     {
-      microsec = data->timeout / time_units_per_microsec;
+      microsec = (time_units_per_microsec == 0)
+	? 0 : data->timeout / time_units_per_microsec;
       tv.tv_sec = 0;
       tv.tv_usec = microsec;
     }
 method='get'>
<input type='hidden' name='id' value='ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>refs</a><a class='active' href='/guix/log/po/doc/guix-manual.es.po'>log</a><a href='/guix/tree/po/doc/guix-manual.es.po?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>tree</a><a href='/guix/commit/po/doc/guix-manual.es.po?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>commit</a><a href='/guix/diff/po/doc/guix-manual.es.po?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/po/doc/guix-manual.es.po'>
<input type='hidden' name='id' value='ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>root</a>/<a href='/guix/log/po?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>po</a>/<a href='/guix/log/po/doc?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>doc</a>/<a href='/guix/log/po/doc/guix-manual.es.po?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c'>guix-manual.es.po</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/po/doc/guix-manual.es.po?id=ce9ea43373d5eb3a9aef8c9b615b98b56b74ba2c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-12 00:18:05 +0200'>2020-04-12</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=935ef44b398353b5b6af94e185d7b0c3d833db0b'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-23 00:06:58 +0100'>2020-03-23</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=86603d8660e42a3b5d8b407e456a98429943bc7e'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-02-14 09:01:29 +0000'>2020-02-14</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=57718bdf6823aef291d114a457c42c984ac42791'>Revert "nls: Update 'es' translation of the manual."</a><span class='msg-avail'>...<span class='msg-tooltip'>I believe this change breaks guix pull:

  ./guix.es.texi:20971: @samp missing closing brace

This reverts commit d156e3fbcd6fc61a39d1d32622b90b0f8f741729.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2020-02-14 04:45:53 +0100'>2020-02-14</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=d156e3fbcd6fc61a39d1d32622b90b0f8f741729'>nls: Update 'es' translation of the manual.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-08-31 21:29:46 +0200'>2019-08-31</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=b212fef4b076faccdd36335c728fd71321778716'>nls: Update 'es' translation of the manual.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-05-13 10:57:11 +0200'>2019-05-13</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=8548cf6e95917f7b56042d2d275a08e91eedf31a'>nls: Update es translation.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-01 11:33:32 +0200'>2019-05-01</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=a3b32d57d6677fded92dbd3f4ecafbf9aceeb855'>nls: Fix cross-reference syntax error in 'guix-manual.es.po'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-manual.es.po: Replace "@pref" with "@pxref".
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-01 10:16:58 +0200'>2019-05-01</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=d3619b296fd1db6441e09bb51b55a4264b9fd0ed'>nls: Update manual translations for de, es, fr, and zh_CN.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 18:55:12 +0200'>2019-04-25</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=57e2b24dc03e44e4e379436e63d29231f1f9d28c'>nls: Update 'es' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-23 23:56:16 +0200'>2019-04-23</span></td><td><a href='/guix/commit/po/doc/guix-manual.es.po?id=6227e1b7477b71f31ea3bf8a74c32fe7238dcece'>doc: Add Spanish translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk (info_TEXINFOS): Add guix.es.texi.
(TRANSLATED_INFO): Add guix.es.texi and contributing.es.texi.
* po/doc/guix-manual.es.po: New file.
* po/doc/local.mk: Add guix-manual.es.po.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Miguel Ángel Arruga Vivas</td></tr>