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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<div class='path'>path: <a href='/guix/log/?id=242e9f0d2cb6c11a2e4f2001ba71beb7e6a68810'>root</a>/<a href='/guix/log/tests?id=242e9f0d2cb6c11a2e4f2001ba71beb7e6a68810'>tests</a>/<a href='/guix/log/tests/scripts-build.scm?id=242e9f0d2cb6c11a2e4f2001ba71beb7e6a68810'>scripts-build.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/scripts-build.scm?id=242e9f0d2cb6c11a2e4f2001ba71beb7e6a68810&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-17 22:55:01 +0100'>2019-03-17</span></td><td><a href='/guix/commit/tests/scripts-build.scm?id=845c44012c2a05436dc0a5316ff3c2a9e5bd725f'>guix build: '--with-commit' makes recursive checkouts.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-17 22:55:01 +0100'>2019-03-17</span></td><td><a href='/guix/commit/tests/scripts-build.scm?id=14328b81a224b726f39dd030886ba8d332027427'>guix build: Transformation options match packages by spec.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-17 22:55:01 +0100'>2019-03-17</span></td><td><a href='/guix/commit/tests/scripts-build.scm?id=880916ac5228b9cfd6e65ac243d17f6bd12edaf9'>guix build: Add '--with-git-url'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-12-23 00:05:05 +0100'>2017-12-23</span></td><td><a href='/guix/commit/tests/scripts-build.scm?id=3e30cdf1c35ebeb52630ec19b3b43b9e6d5ffb81'>guix build: Support '--with-source=PACKAGE@VERSION=URI'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-21 22:53:59 +0200'>2017-04-21</span></td><td><a href='/guix/commit/tests/scripts-build.scm?id=904c6c42eb8c3805edd293666eeb4b3837e2b7a6'>tests: Adjust to the addition of a new Coreutils version.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-12-21 23:48:14 +0100'>2016-12-21</span></td><td><a href='/guix/commit/tests/scripts-build.scm?id=7c247809efe5d6a2a11617f41f45a2b6e8d6855f'>guix build: '--with-source' overrides the 'replacement' of a package.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>