From a589b7bd5fc7f056e5595456b354a51668adbc07 Mon Sep 17 00:00:00 2001
From: Nikolay Amiantov <ab@fmap.me>
Date: Sat, 30 Apr 2016 03:00:09 +0300
Subject: [PATCH] ijs: derive from ghostscript

---
 pkgs/development/libraries/ijs/default.nix | 11 +++--------
 pkgs/misc/ghostscript/default.nix          |  2 ++
 2 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/pkgs/development/libraries/ijs/default.nix b/pkgs/development/libraries/ijs/default.nix
index da0ae463e859..a08a653dc71f 100644
--- a/pkgs/development/libraries/ijs/default.nix
+++ b/pkgs/development/libraries/ijs/default.nix
@@ -1,14 +1,9 @@
-{ stdenv, fetchurl, fetchpatch, autoreconfHook }:
+{ stdenv, fetchurl, fetchpatch, autoreconfHook, ghostscript }:
 
-let version = "9.18";
-in
 stdenv.mkDerivation {
-  name = "ijs-${version}";
+  name = "ijs-${ghostscript.version}";
 
-  src = fetchurl {
-    url = "http://downloads.ghostscript.com/public/ghostscript-${version}.tar.bz2";
-    sha256 = "18ad90za28dxybajqwf3y3dld87cgkx1ljllmcnc7ysspfxzbnl3";
-  };
+  inherit (ghostscript) src;
 
   patches = [
     # http://bugs.ghostscript.com/show_bug.cgi?id=696246
diff --git a/pkgs/misc/ghostscript/default.nix b/pkgs/misc/ghostscript/default.nix
index 06ffc45cecf3..93e83a375a48 100644
--- a/pkgs/misc/ghostscript/default.nix
+++ b/pkgs/misc/ghostscript/default.nix
@@ -126,6 +126,8 @@ stdenv.mkDerivation rec {
     install_name_tool -change libgs.dylib.${version} $out/lib/libgs.dylib.${version} $out/bin/gs
   '';
 
+  passthru = { inherit version; };
+
   meta = {
     homepage = "http://www.ghostscript.com/";
     description = "PostScript interpreter (mainline version)";