anchor.diff:  , libsndfile
   , lilv
   , lv2
  +, pangomm
   , qjackctl
   , serd
   , sord
   , sratom
  -, webkitgtk_2_4_gtk2
   , zita-convolver
   , zita-resampler
  -, optimizationSupport ? false # Enable support for native CPU extensions
  +
  +# Enable support for native CPU extensions
  +, optimizationSupport ? false
   }:
   
  -let
  -  inherit (stdenv.lib) optional;
  -in
  +with {
  +  inherit (stdenv.lib)
  +    optional;
  +};
   
   stdenv.mkDerivation rec {
     name = "guitarix-${version}";
  -  version = "0.34.0";
  +  #version = "0.34.0";
  +  version = "2016-02-14";
   
  -  src = fetchurl {
  +  /*src = fetchurl {
       url = "mirror://sourceforge/guitarix/guitarix2-${version}.tar.bz2";
       sha256 = "0pamaq8iybsaglq6y1m1rlmz4wgbs2r6m24bj7x4fwg4grjvzjl8";
  +  };*/
  +  # Support for disabling webkitgtk will be in the 0.35.0 release
  +  src = fetchgit {
  +    url = "http://git.code.sf.net/p/guitarix/git";
  +    rev = "4682d8ca6d9c76d3b1bc8da489ded7d043d27d65";
  +    sha256 = "0j3x64llfy51szmysn83fgs79qj8sz20rgiq59kwc1qm081z1hvm";
     };
  -
  -  NIX_CFLAGS_COMPILE = [
  -    #"-std=c++11"
  -    "-I${eigen}/include/eigen3"
  -  ];
   
     nativeBuildInputs = [
       gettext
       intltool
  -    pkgconfig
  +    makeWrapper
       python
     ];
   
     buildInputs = [
  +    atkmm
       avahi
       #bluez
       boost
  +    gdk-pixbuf
       eigen
       fftw
       glib
  
positive.code:     libsndfile
      lilv
      lv2
      serd
      sord
      sratom
      webkitgtk_2_4_gtk2
      zita-convolver
      zita-resampler
    ];
  
    configureFlags = [
      "--nocache"
  
negative.code: { stdenv
  , fetchgit
  , fetchurl
  , gettext
  , intltool
  , makeWrapper
  , python
  
  , atkmm
  , avahi
  , bluez
  , boost
  , eigen
  , fftw
  , gdk-pixbuf
  , glib
  , glibmm
  , gtk2
  