The file $(top_srcdir)/gtk-doc.make doesn't exist, so don't include it.

--- a/doc/Makefile.in	2007-04-08 20:17:25.000000000 +0200
+++ b/doc/Makefile.in	2014-09-06 23:19:41.413397662 +0200
@@ -240,9 +240,6 @@
 distclean-generic clean-generic maintainer-clean-generic clean \
 mostlyclean distclean maintainer-clean
 
-
-include $(top_srcdir)/gtk-doc.make
-
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
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'2021-01-03 00:12:39 +0200'>2021-01-03</span></td><td><a href='/guix/commit/gnu/packages/spice.scm?id=395489cdc959c3f3c026bf545c3ed95efc9919f0'>gnu: spice-vdagent: Update to 0.20.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/spice.scm (spice-vdagent): Update to 0.20.0.
[inputs]: Add libdrm.

Signed-off-by: Efraim Flashner &lt;efraim@flashner.co.il&gt;
</span></span></td><td>Vincent Legoll</td></tr>
<tr><td><span title='2020-11-05 04:00:13 +0100'>2020-11-05</span></td><td><a href='/guix/commit/gnu/packages/spice.scm?id=facdae042d034057a3255fc01336fa8a23491682'>gnu: virt-viewer: Enable VNC support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/spice.scm (virt-viewer)[inputs]: Add gtk-vnc.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-10-06 02:54:02 +0200'>2020-10-06</span></td><td><a href='/guix/commit/gnu/packages/spice.scm?id=05e9a46347649b8b5014118a8574fe2e4d210d76'>gnu: spice-protocol: Update to 0.14.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/spice.scm (spice-protocol): Update to 0.14.3.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-09-24 00:37:39 -0400'>2020-09-24</span></td><td><a href='/guix/commit/gnu/packages/spice.scm?id=035df987f11cb64d99257f42932a155ebceac685'>gnu: spice-gtk: Only use "good" GStreamer plugins out of the box.</a><span class='msg-avail'>...<span class='msg-tooltip'>Do not propagate plugins that are known to be patent encumbered out of the
box, so the user has a choice.

* gnu/packages/spice.scm (spice-gtk)[propagated-inputs]: Remove gst-libav,
gst-plugins-bad and gst-plugins-ugly.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Mark H Weaver</td></tr>