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='2019-09-23 23:46:48 +0200'>2019-09-23</span></td><td><a href='/guix/commit/gnu/packages/patches/bash-linux-pgrp-pipe.patch?id=567cca260d54a4515097ff3f2dc277d10ceaf613'>gnu: bash: Unconditionally configure PGRP_PIPE for *-linux systems.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>