diff --git a/pkgs/all-packages.nix b/pkgs/all-packages.nix
index 44e81af..4cecab4 100644
--- a/pkgs/all-packages.nix
+++ b/pkgs/all-packages.nix
@@ -10,5 +10,6 @@ self: pkgs: with pkgs; {
 
   openslide = callPackage ./openslide { };
   openslide-python = callPackage ./openslide/python.nix { };
-}
 
+  sumo = callPackage ./sumo.nix { };
+}
diff --git a/sumo.nix b/pkgs/sumo.nix
similarity index 69%
rename from sumo.nix
rename to pkgs/sumo.nix
index 3a21f5f..8db8ea4 100644
--- a/sumo.nix
+++ b/pkgs/sumo.nix
@@ -1,15 +1,19 @@
-with import <nixpkgs> { };
+{ stdenv, fetchurl, unzip
+, lzma, bzip2, zlib, libjpeg, libtiff, openssl
+, mesa, xorg
+, fox_1_6, xercesc, proj, gdal, hdf5, curl }:
 
-stdenv.mkDerivation {
-  name = "sumo-0.25.0";
+stdenv.mkDerivation rec {
+  version = "0.25.0";
+  name = "sumo-${version}";
 
   src = fetchurl {
-    url = "http://www.dlr.de/ts/en/Portaldata/16/Resources/projekte/sumo/sumo-src-0.25.0.zip";
+    url = "http://www.dlr.de/ts/en/Portaldata/16/Resources/projekte/sumo/sumo-src-${version}.zip";
     sha256 = "0qg1hwcf9z2v2lk3csvhq2yhk4x4kliipib67fkbv808b5jczlqr";
   };
 
   buildInputs = [
-    unzip lzma bzip2 zlib 
+    unzip lzma bzip2 zlib
     libjpeg libtiff
     openssl
     mesa xorg.libX11