diff --git a/cfg.mk b/cfg.mk
index 306e02b..ce66a42 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -41,6 +41,8 @@ update-copyright-env = \
 
 include $(srcdir)/dist-check.mk
 
+gendocs_options_ = -s $(srcdir)/diff.texi
+
 _cf_state_dir ?= .config-state
 _date_time := $(shell date +%F.%T)
 config-compare:
diff --git a/gnulib b/gnulib
index d3d059c..cbbec35 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit d3d059cf53625ddfe2ff4f64759131e846f83b94
+Subproject commit cbbec352566be60d2ede1ee43f6bc911e547d8b0