diff -aur pam_ldap-186.old/vers_string pam_ldap-186/vers_string
--- pam_ldap-186.old/vers_string	2021-12-29 21:45:36.010231609 +0100
+++ pam_ldap-186/vers_string	2021-12-29 22:24:03.167959325 +0100
@@ -3,17 +3,19 @@
 #ident $Id: vers_string,v 1.2 2010/02/25 14:40:39 lukeh Exp $
 #
 # Implementation of SGS vers_string which uses CVSVersionInfo.txt.
+use POSIX qw(strftime);
+
 
 require "cvslib.pl";
 
 $OUTFILE = (-f "version.h") ? "version.h" : "vers.c";
 $AUTHOR = `whoami`;
 $HEADER = '$Id: vers_string,v 1.2 2010/02/25 14:40:39 lukeh Exp $';
+$DATE = strftime("%Y-%m-%d", gmtime($ENV{SOURCE_DATE_EPOCH} || time));
 
 if ($ENV{'PROGRAM'}) { $PROGRAM = $ENV{'PROGRAM'}; }
 
 chop($AUTHOR);
-chop($DATE=`date -u`);
 chop($CWD=`pwd`);
 
 ($PROJECT, $VERSION) = split(/\-/, &getCVSVersionInfo());