Added a long description. Added the patch file.

pkgs/tools/X11/nitrogen/default.nix

@@ -1,12 +1,15 @@
 { stdenv, fetchurl, pkgconfig, glib, gtk2, gtkmm }:
 
+let version = "1.5.2";
+in
 stdenv.mkDerivation rec {
-  name = "nitrogen-1.5.2";
+  name = "nitrogen-${version}";
 
   src = fetchurl {
-    url = "http://projects.l3ib.org/nitrogen/files/nitrogen-1.5.2.tar.gz";
+    url = "http://projects.l3ib.org/nitrogen/files/nitrogen-${version}.tar.gz";
     sha256 = "60a2437ce6a6c0ba44505fc8066c1973140d4bb48e1e5649f525c7b0b8bf9fd2";
   };
+
   buildInputs = [ glib gtk2 gtkmm pkgconfig ];
 
   NIX_LDFLAGS = "-lX11";
@@ -14,7 +17,13 @@ stdenv.mkDerivation rec {
   patches = [ ./nitrogen-env-bash.patch ];
 
   meta = {
-    description = "A background browser and setter for X windows";
+    description = "A wallpaper browser and setter for X11";
+    longDescription = ''
+      nitrogen is a lightweight utility that can set the root background on X11.
+      It operates independently of any desktop environment, and supports
+      multi-head with Xinerama. Wallpapers are browsable with a convenient GUI,
+      and settings are stored in a human-readable config file.
+    '';
     homepage = http://projects.l3ib.org/nitrogen/;
     license = stdenv.lib.licenses.gpl2;
     platforms = stdenv.lib.platforms.linux;

pkgs/tools/X11/nitrogen/nitrogen-env-bash.patch

@@ -0,0 +1,10 @@
+diff --git a/data/icon-theme-installer b/data/icon-theme-installer
+index 328cf73..ca5d226 100755
+--- a/data/icon-theme-installer
++++ b/data/icon-theme-installer
+@@ -1,4 +1,4 @@
+-#!/bin/bash
++#!/usr/bin/env bash
+ 
+ # icon-theme-installer
+ # Copyright (C) 2006 Novell, Inc.