From edd3e40f91fa2535981706f45bb67253ccb50813 Mon Sep 17 00:00:00 2001
From: Basile Henry <bjm.henry@gmail.com>
Date: Mon, 16 Nov 2020 15:22:06 +0000
Subject: [PATCH] Make autogen.man reproducible

Keep the date format similar to what it is when we are not using the
MAN_PAGE_DATE env var. The man pages scripts seem to use different
formats in different pages, so we use the most common format for all.
---
 pkgs/development/tools/misc/autogen/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/tools/misc/autogen/default.nix b/pkgs/development/tools/misc/autogen/default.nix
index 87b8bde58ad..23235499cfb 100644
--- a/pkgs/development/tools/misc/autogen/default.nix
+++ b/pkgs/development/tools/misc/autogen/default.nix
@@ -42,6 +42,10 @@ stdenv.mkDerivation rec {
     guile libxml2
   ];
 
+  preConfigure = ''
+    export MAN_PAGE_DATE=$(date '+%Y-%m-%d' -d "@$SOURCE_DATE_EPOCH")
+  '';
+
   configureFlags =
     [
       # Make sure to use a static value for the timeout. If we do not set a value