[gtk-doc] Remove tmpl in make maintainer-clean
diff --git a/docs/reference/Makefile.am b/docs/reference/Makefile.am
index 71a75db..1da46a6 100644
--- a/docs/reference/Makefile.am
+++ b/docs/reference/Makefile.am
@@ -106,4 +106,7 @@
 #TESTS = $(GTKDOC_CHECK)
 endif
 
+maintainer-clean-local:
+	-rm -rf $(srcdir)/tmpl
+
 -include $(top_srcdir)/git.mk