Without <sys/time.h>, gettimeofday is undefined.

diff --git a/src/AudioIO.cpp b/src/AudioIO.cpp
index 0187e3962..e15d55f4c 100644
--- a/src/AudioIO.cpp
+++ b/src/AudioIO.cpp
@@ -479,6 +479,8 @@ time warp info and AudioIOListener and whether the playback is looped.
 #include "../lib-src/portmidi/porttime/porttime.h"
 #include "../lib-src/header-substitutes/allegro.h"
 
+#include <sys/time.h>
+
    #define MIDI_SLEEP 10 /* milliseconds */
    // how long do we think the thread that fills MIDI buffers,
    // if it is separate from the portaudio thread,
ix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='1c916c167b7eb1f2f8af2cf621aa1512b00b1033'/><input type='hidden' name='showmsg' value='1'/><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=1c916c167b7eb1f2f8af2cf621aa1512b00b1033'>refs</a><a class='active' href='/guix/log/gnu/system/uuid.scm?showmsg=1'>log</a><a href='/guix/tree/gnu/system/uuid.scm?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033'>tree</a><a href='/guix/commit/gnu/system/uuid.scm?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033'>commit</a><a href='/guix/diff/gnu/system/uuid.scm?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/system/uuid.scm'>
<input type='hidden' name='id' value='1c916c167b7eb1f2f8af2cf621aa1512b00b1033'/><input type='hidden' name='showmsg' value='1'/><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=1c916c167b7eb1f2f8af2cf621aa1512b00b1033&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/system?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033&amp;showmsg=1'>system</a>/<a href='/guix/log/gnu/system/uuid.scm?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033&amp;showmsg=1'>uuid.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/gnu/system/uuid.scm?id=1c916c167b7eb1f2f8af2cf621aa1512b00b1033'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2023-06-18 02:00:10 +0200'>2023-06-18</span></td><td class='logsubject'><a href='/guix/commit/gnu/system/uuid.scm?id=65ed7a61f1ad01da440f0e7e08bfc32b43deed73'>uuid: Fix NTFS UUID stringification.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
Previously, (ntfs-uuid-&gt;string (string-&gt;ntfs-uuid"5234ED0D34ECF53F"))
would yield "5234EDD34ECF53F".

Reported by sughosha in #guix.

* gnu/system/uuid.scm (ntfs-uuid-&gt;string): Pad hex bytes with zero when
needed.


</td></tr>
<tr class='logheader'><td><span title='2021-09-23 18:17:17 +0200'>2021-09-23</span></td><td class='logsubject'><a href='/guix/commit/gnu/system/uuid.scm?id=90604348e14913da48327da05113d7da8ae7655a'>uuid: Support XFS.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/system/uuid.scm (string-&gt;xfs-uuid): New procedure.
(%uuid-parsers, %uuid-printers): Add ‘xfs’ file system type.


</td></tr>
<tr class='logheader'><td><span title='2020-11-07 13:40:46 +0100'>2020-11-07</span></td><td class='logsubject'><a href='/guix/commit/gnu/system/uuid.scm?id=e87471dc510bc393e3306fba86f919dc6bf89b7b'>uuid: Add support for bcachefs.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/system/uuid.scm (string-&gt;bcachefs-uuid): New exported procedure.
(%uuid-parsers, %uuid-printers): Add the ‘bcachefs’ file system type.


</td></tr>