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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<tr><td><span title='2020-04-21 16:33:21 +0200'>2020-04-21</span></td><td><a href='/guix/commit/gnu/tests/ssh.scm?id=a295a1ca2942794ac52321a639128f94be595ac5'>tests: ssh: Explicitly wait for port 22.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously we could occasionally try to connect before the server is
actually listening, both for OpenSSH and Dropbear.

* gnu/tests/ssh.scm (run-ssh-test)["wait for port 22"]: New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-09 12:11:36 +0200'>2019-05-09</span></td><td><a href='/guix/commit/gnu/tests/ssh.scm?id=e6b1a2248ff164e14d1b2f495224faf8a8326142'>services: Log-in services now require "pam_loginuid".</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/35553&gt;.
Reported by Bruno Haible &lt;bruno@clisp.org&gt;.

* gnu/services/base.scm (login-pam-service): Pass #:login-uid? #t to
'unix-pam-service'.
* gnu/services/ssh.scm (lsh-pam-services, openssh-pam-services):
Likewise.
* gnu/services/xorg.scm (slim-pam-service): Likewise.
(gdm-pam-service): Likewise for "gdm-autologin" and "gdm-password".
* gnu/tests/base.scm (run-basic-test)["getlogin on tty1"]: New test.
* gnu/tests/ssh.scm (run-ssh-test): Add #:test-getlogin? parameter.
["getlogin"]: New test.
(%test-dropbear): Pass #:test-getlogin? #f.
</span></span></td><td>Ludovic Courtès</td></tr>