anchor.diff:  { stdenv, fetchurl, gettext, intltool, pkgconfig, python2
   , avahi, bluez, boost, eigen, fftw, glib, glib_networking
   , glibmm, gsettings_desktop_schemas, gtkmm2, libjack2
  -, ladspaH, librdf, libsndfile, lilv, lv2, serd, sord, sratom
  -, webkitgtk2, wrapGAppsHook, zita-convolver, zita-resampler
  +, ladspaH, libav, librdf, libsndfile, lilv, lv2, serd, sord, sratom
  +, wrapGAppsHook, zita-convolver, zita-resampler
   , optimizationSupport ? false # Enable support for native CPU extensions
   }:
   
  
positive.code:     "--no-desktop-update"
      "--enable-nls"
      "--no-faust" # todo: find out why --faust doesn't work
    ] ++ optional optimizationSupport "--optimization";
  
    configurePhase = ''python2 waf configure --prefix=$out $configureFlags'';
  
negative.code: 
    buildInputs = [
      avahi bluez boost eigen fftw glib glibmm glib_networking.out
      gsettings_desktop_schemas gtkmm2 libjack2 ladspaH libav librdf
      libsndfile lilv lv2 serd sord sratom zita-convolver
      zita-resampler
    ];
  
  