[PATCH] gnu: Correct libical zoneinfo search path.

[Kei Yamashita <kei@openmailbox.org>]

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This is a patch to fix the bug that stopped me from packaging GNOME
Calendar and possibly some other packages, too.

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From 94bad2babd14d7220914ba2aaa43cd373d1fd5a3 Mon Sep 17 00:00:00 2001
From: Kei Yamashita <kei@openmailbox.org>
Date: Mon, 9 May 2016 23:59:53 -0400
Subject: [PATCH] gnu: Correct libical zoneinfo search path.

* gnu/packages/calendar.scm (libical): Modify variable.
---
 gnu/packages/calendar.scm | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/calendar.scm b/gnu/packages/calendar.scm
index 5ef5ec9..0dcfd47 100644
--- a/gnu/packages/calendar.scm
+++ b/gnu/packages/calendar.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
 ;;; Copyright © 2015, 2016 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2016 Kei Yamashita <kei@openmailbox.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -47,11 +48,24 @@
                 "14lmjj63zyx88rf1z71l0v9ms4c2vpdhmixksjjxgywp5p2f7708"))))
     (build-system cmake-build-system)
     (arguments
-     '(#:tests? #f)) ; test suite appears broken
+     '(#:tests? #f ; test suite appears broken
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'patch-paths
+           (lambda _
+             (let ((tzdata (assoc-ref %build-inputs "tzdata")))
+               (substitute* "src/libical/icaltz-util.c"
+                 (((string-append "\"/usr/share/zoneinfo\","
+                                  "\"/usr/lib/zoneinfo\","
+                                  "\"/etc/zoneinfo\","
+                                  "\"/usr/share/lib/zoneinfo\""))
+                  (string-append "\"" tzdata "/share/zoneinfo\""))))
+             #t)))))
     (native-inputs
      `(("perl" ,perl)))
     (inputs
-     `(("icu4c" ,icu4c)))
+     `(("icu4c" ,icu4c)
+       ("tzdata" ,tzdata)))
     (home-page "https://libical.github.io/libical/")
     (synopsis "iCalendar protocols and data formats implementation")
     (description
-- 
2.7.4


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