From ea23a124ad3e7065fe22844ee637bb9c0ecfef56 Mon Sep 17 00:00:00 2001
From: Janneke Nieuwenhuizen <janneke@gnu.org>
Date: Sat, 9 Sep 2023 13:35:40 +0200
Subject: maint: Help help2man generate reproducible man-pages.

* doc/local.mk (SOURCE_DATE_EPOCH): New exported variable.

Change-Id: I6636693695d5502657f1475d93d31949e0b0b39d
---
 doc/local.mk | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'doc')

diff --git a/doc/local.mk b/doc/local.mk
index 18bd599962..a653a32420 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -224,6 +224,9 @@ gen_man =						\
   $(HELP2MANFLAGS)
 
 HELP2MANFLAGS = --source=GNU --info-page=$(PACKAGE_TARNAME)
+# help2man reproducibility
+SOURCE_DATE_EPOCH = $(shell git show HEAD --format=%ct --no-patch 2>/dev/null || echo 1)
+export SOURCE_DATE_EPOCH
 
 $(srcdir)/%D%/guix.1: scripts/guix.in $(sub_commands_mans)
 	-$(AM_V_HELP2MAN)$(gen_man) --output="$@" `basename "$@" .1`
-- 
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