From a32d0c8304a60ad77ecae59aab9cb1c7241f8162 Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Sat, 17 Dec 2016 23:10:32 +0100
Subject: gnu: sane-backends: Remove timestamps from the output.

* gnu/packages/scanner.scm (sane-backends-minimal)[source](modules, snippet):
New fields.
---
 gnu/packages/scanner.scm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/scanner.scm b/gnu/packages/scanner.scm
index fdad1c4459..7bdbf35f05 100644
--- a/gnu/packages/scanner.scm
+++ b/gnu/packages/scanner.scm
@@ -39,7 +39,14 @@ (define-public sane-backends-minimal
                    "sane-backends-" version ".tar.gz"))
              (sha256
               (base32
-               "0b3fvhrxl4l82bf3v0j47ypjv6a0k5lqbgknrq1agpmjca6vmmx4"))))
+               "0b3fvhrxl4l82bf3v0j47ypjv6a0k5lqbgknrq1agpmjca6vmmx4"))
+             (modules '((guix build utils)))
+             (snippet
+              ;; Generated HTML files and udev rules normally embed a
+              ;; timestamp.  Work around that to build things reproducibly.
+              '(substitute* "tools/sane-desc.c"
+                 (("asctime \\(localtime \\(&current_time\\)\\)")
+                  "\"1970-01-01\"")))))
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)))
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