--- a/debian/patches/007-reproducible-build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/007-reproducible-build.patch	2016-08-27 19:03:30.649751284 +0100
@@ -0,0 +1,70 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby@debian.org>
+Last-Update: 2016-08-27
+
+--- netrek-client-cow-3.3.0.orig/mkcflags.c
++++ netrek-client-cow-3.3.0/mkcflags.c
+@@ -5,6 +5,8 @@
+ #include <sys/types.h>
+ 
+ #include <time.h>
++#include <errno.h>
++#include <limits.h>
+ #include INC_SYS_TIME
+ #include <pwd.h>
+ #include "version.h"
+@@ -31,6 +33,8 @@ main (argc, argv)
+   char tbuff1[100], tbuff2[100];
+   char pigcall[120];
+   char *pigcallresp ();
++  char *source_date_epoch, *endptr;
++  unsigned long long epoch;
+ 
+   if (argc != 3)
+     {
+@@ -39,6 +43,34 @@ main (argc, argv)
+     }
+   seconds = time(0);
+   tm_date = localtime (&seconds);
++  source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++  if (source_date_epoch)
++  {
++    errno = 0;
++    epoch = strtoull(source_date_epoch, &endptr, 10);
++    if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0))
++        || (errno != 0 && epoch == 0))
++    {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n", strerror(errno));
++      exit(EXIT_FAILURE);
++    }
++    if (endptr == source_date_epoch)
++    {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n", endptr);
++      exit(EXIT_FAILURE);
++    }
++    if (*endptr != '\0')
++    {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n", endptr);
++      exit(EXIT_FAILURE);
++    }
++    if (epoch > ULONG_MAX)
++    {
++      fprintf(stderr, "Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to: %lu but was found to be: %llu \n", ULONG_MAX, epoch);
++      exit(EXIT_FAILURE);
++    }
++    tm_date = gmtime (&epoch);
++  }
+   strftime (tbuff1, sizeof (tbuff1), "%a %b %d, %Y %r", tm_date);
+   strftime (tbuff2, sizeof (tbuff2), "%D", tm_date);
+   printf ("/*****************************************************************************/\n");
+--- netrek-client-cow-3.3.0.orig/sample_key.def
++++ netrek-client-cow-3.3.0/sample_key.def
+@@ -31,7 +31,7 @@ SECKEYFILE	= $(KEYFILE).secret
+ # CWHO		= \"`whoami`@`hostname`\"
+ # CWHO		= \"`whoami`@`domainname`\"
+ # CWHO		= \"`whoami`@`hostname`.`domainname`\"
+-CWHO		= \"`whoami`@`hostname -f`\"
++CWHO		= \"generic@generic\"
+ 
+ 
+ #######################################################################
--- a/debian/patches/series	2016-08-27 18:41:56.136219129 +0100
--- b/debian/patches/series	2016-08-27 19:03:28.625725285 +0100
@@ -4,3 +4,4 @@
 004-honor-flags.patch
 005-hardening.patch
 006-gcc5.patch
+007-reproducible-build.patch