Yet another try to make build without gtk-doc succeed

autogen.sh

@@ -24,6 +24,7 @@ if which gtkdocize ; then
 	gtkdocize --copy || exit 1
 else
 	echo "*** No gtkdocize found, skipping documentation ***"
+	> gtk-doc.make
 fi
 
 echo -n "checking for autoreconf... "

docs/reference/Makefile.am

@@ -88,7 +88,7 @@ GTKDOC_LIBS+=$(top_builddir)/src/libharfbuzz-gobject.la
 endif
 
 # This includes the standard gtk-doc make rules, copied by gtkdocize.
--include $(top_srcdir)/gtk-doc.make
+include $(top_srcdir)/gtk-doc.make
 
 # Other files to distribute
 # e.g. EXTRA_DIST += version.xml.in