Update/fix farstream: Gajim now at least builds

pkgs/development/libraries/gstreamer/python/default.nix

@@ -0,0 +1,34 @@
+{ fetchurl, stdenv, pkgconfig, python, gstreamer
+  , gst-plugins-base, pygtk, pygobject3
+}:
+
+stdenv.mkDerivation rec {
+  name = "gst-python-1.1.90";
+
+  src = fetchurl {
+    urls = [
+      "${meta.homepage}/src/gst-python/${name}.tar.bz2"
+      "mirror://gentoo/distfiles/${name}.tar.bz2"
+      ];
+    sha256 = "1vsykx2l5360y19c0rxspa9nf1ilml2c1ybsv8cw8p696scryb2l";
+  };
+
+  buildInputs =
+    [ pkgconfig gst-plugins-base pygtk pygobject3 ]
+    ;
+
+  preConfigure = ''
+    export configureFlags="$configureFlags --with-pygi-overrides-dir=$out/lib/${python.libPrefix}/site-packages/gi/overrides"
+  '';
+
+  propagatedBuildInputs = [ gstreamer python ];
+ 
+  meta = {
+    homepage = http://gstreamer.freedesktop.org;
+
+    description = "Python bindings for GStreamer";
+
+    license = "LGPLv2+";
+  };
+}
+