commit d2f9fa8d7f59c357449ab2b69141700cb5527135
Author: Bernhard M. Wiedemann <bwiedemann@suse.de>
Date:   Sun Jun 18 19:49:43 2017 +0200

    allow to override build date
    
    to allow reproducible builds of x3270
    
    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.

diff --git a/Common/mkversion.sh b/Common/mkversion.sh
index f5cd712c..33100743 100755
--- a/Common/mkversion.sh
+++ b/Common/mkversion.sh
@@ -40,15 +40,17 @@ export LANG LC_ALL
 set -e
 
 . ${2-./version.txt}
-builddate=`date`
-sccsdate=`date +%Y/%m/%d`
+date="date -u"
+[ -n "$SOURCE_DATE_EPOCH" ] && date="$date -d@$SOURCE_DATE_EPOCH"
+builddate=`$date`
+sccsdate=`$date +%Y/%m/%d`
 user=${LOGNAME-$USER}
 
 # Create an all numeric timestamp for rpqnames.
 # rpq.c will return this string of numbers in bcd format
 # It is OK to change the length (+ or -), but use
 # decimal (0-9) digits only. Length must be even number of digits.
-rpq_timestamp=`date +%Y%m%d%H%M%S`
+rpq_timestamp=`$date +%Y%m%d%H%M%S`
 
 app=${1-x3270}
 cat <<EOF