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='2020-05-16 14:52:18 -0400'>2020-05-16</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=5c4aa84e4ab891ae2cfc10b8601113887550c070'>gnu: heimdal: Update to 7.7.0.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-03-26 12:59:35 +0100'>2020-03-26</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=770ea94c9cde701ae3b45f313799b9d95154c267'>gnu: mit-krb5: Supprt for the Hurd.</a><span class='msg-avail'>...</span></td><td>Jan Nieuwenhuizen</td></tr>
<tr><td><span title='2020-03-14 12:02:53 +0100'>2020-03-14</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=e59d958a9c9a509ce34ca553a5b1b03e406d561f'>gnu: mit-krb5: Fix segfault in gsasl test suite.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-03-10 20:50:02 +0100'>2020-03-10</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=50b99c90c87642f664f9c9523a6e40fc8542ddcf'>Merge branch 'master' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-03-09 16:01:18 +0100'>2020-03-09</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=a0087cf58d1172bcb9267d349bfc8497721bc15d'>gnu: mit-krb5: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-02-15 22:02:56 +0100'>2020-02-15</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=32d3f81a494e4b37c96ddbc23ff9a5a8140e8591'>gnu: mit-krb5: Update to 1.18.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-01-17 12:57:32 +0100'>2020-01-17</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=4798554038271f1a6d1319313ca68ea99ddaabbe'>gnu: mit-krb5: Set localstatedir to /var.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2020-01-08 21:56:03 +0100'>2020-01-08</span></td><td><a href='/guix/commit/gnu/packages/kerberos.scm?id=972a3e0b1e40eeb58350fa322122890bd776f3d7'>gnu: mit-krb5: Update to 1.17.1.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>