From 6f54210db29db71fd84e0e880435840a9b76da3c Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Thu, 5 Oct 2017 14:13:53 +0200
Subject: [PATCH] configure: allow to override build date

in order to make builds reproducible.
See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.
---
 configure | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 45eddf1..7b57992 100755
--- a/configure
+++ b/configure
@@ -550,7 +550,11 @@ then
     split_seconds=$ntp_era_split
     split_days=0
   else
-    split_seconds=`date '+%s'`
+    if [ "x$SOURCE_DATE_EPOCH" != "x" ]; then
+      split_seconds=$SOURCE_DATE_EPOCH
+    else
+      split_seconds=`date '+%s'`
+    fi
     if [ "x$split_seconds" = "x" ]; then
       echo "error: could not get current time, --with-ntp-era option is needed"
       exit 1