gnu: Add zathura.

* gnu/packages/pdf.scm (zathura): New variable.
* gnu/packages/patches/zathura-plugindir-environment-variable.patch: New file.
* gnu-system.am: Add it.

gnu-system.am

@@ -551,7 +551,8 @@ dist_patch_DATA =						\
   gnu/packages/patches/xf86-video-trident-remove-mibstore.patch	\
   gnu/packages/patches/xf86-video-vmware-glibc-2.20.patch	\
   gnu/packages/patches/xfce4-panel-plugins.patch		\
-  gnu/packages/patches/xmodmap-asprintf.patch
+  gnu/packages/patches/xmodmap-asprintf.patch 			\
+  gnu/packages/patches/zathura-plugindir-environment-variable.patch
 
 MISC_DISTRO_FILES = gnu/packages/javac.in
 

gnu/packages/patches/zathura-plugindir-environment-variable.patch

@@ -0,0 +1,35 @@
+From ae8e4cc9ab57ff25d2ba6c4b369e8531ce43a6d2 Mon Sep 17 00:00:00 2001
+From: Paul van der Walt <paul@denknerd.org>
+Date: Mon, 2 Mar 2015 22:15:39 +0100
+Subject: [PATCH] Search path environment variable for Zathura.
+
+Adds a search path environment variable for zathura plugins (for reading
+different file formats) called ZATHURA_PLUGIN_PATH. Command line option
+-p still takes precedence.
+
+Patch by Paul van der Walt <paul@denknerd.org>
+---
+ zathura/zathura.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/zathura/zathura.c b/zathura/zathura.c
+index 589dd28..375ec54 100644
+--- a/zathura/zathura.c
++++ b/zathura/zathura.c
+@@ -413,6 +413,13 @@ zathura_set_plugin_dir(zathura_t* zathura, const char* dir)
+   g_return_if_fail(zathura != NULL);
+   g_return_if_fail(zathura->plugins.manager != NULL);
+ 
++  /* Added for Guix: check if environment variable
++   * is set to specify location of zathura plugins.
++   */
++
++  if (dir == NULL)
++    dir = g_getenv("ZATHURA_PLUGIN_PATH");
++
+   if (dir != NULL) {
+     girara_list_t* paths = girara_split_path_array(dir);
+     GIRARA_LIST_FOREACH(paths, char*, iter, path)
+-- 
+2.3.1
+

gnu/packages/pdf.scm

@@ -2,6 +2,7 @@
 ;;; Copyright © 2013, 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014, 2015 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2015 Paul van der Walt <paul@denknerd.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -28,6 +29,9 @@
   #:use-module (gnu packages compression)
   #:use-module (gnu packages fontutils)
   #:use-module (gnu packages ghostscript)
+  #:use-module (gnu packages databases)
+  #:use-module (gnu packages gettext)
+  #:use-module (gnu packages backup)
   #:use-module (gnu packages lesstif)
   #:use-module (gnu packages image)
   #:use-module (gnu packages pkg-config)
@@ -143,6 +147,46 @@
    (license license:gpl3) ; or gpl2, but not gpl2+
    (home-page "http://www.foolabs.com/xpdf/")))
 
+(define-public zathura
+  (package
+    (name "zathura")
+    (version "0.3.2")
+    (source (origin
+              (method url-fetch)
+              (uri
+               (string-append "https://pwmt.org/projects/zathura/download/zathura-"
+                              version ".tar.gz"))
+              (sha256
+               (base32
+                "1qk5s7cyqp4l673yhma5igk9g24p5jyqyy81fdk7q7xjqlym19px"))
+              (patches
+               (list
+                (search-patch "zathura-plugindir-environment-variable.patch")))))
+    (native-inputs `(("pkg-config" ,pkg-config)
+                     ("gettext" ,gnu-gettext)))
+    (inputs `(("girara" ,girara)
+              ("sqlite" ,sqlite)
+              ("gtk+" ,gtk+)))
+    (native-search-paths
+     (list (search-path-specification
+            (variable "ZATHURA_PLUGIN_PATH")
+            (files '("lib/zathura")))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:make-flags
+       `(,(string-append "PREFIX=" (assoc-ref %outputs "out"))
+         "CC=gcc" "COLOR=0")
+       #:tests? #f ; Tests fail: "Gtk cannot open display".
+       #:test-target "test"
+       #:phases
+       (alist-delete 'configure %standard-phases)))
+    (home-page "https://pwmt.org/projects/zathura/")
+    (synopsis "Lightweight keyboard-driven PDF viewer")
+    (description "Zathura is a customizable document viewer.  It provides a
+minimalistic interface and an interface that mainly focuses on keyboard
+interaction.")
+    (license license:zlib)))
+
 (define-public podofo
   (package
     (name "podofo")