anchor.diff:      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
  +    zita-resampler curl
     ];
   
     configureFlags = [
  
positive.code: 
  stdenv.mkDerivation rec {
    name = "guitarix-${version}";
    version = "0.37.1";
  
    src = fetchurl {
      url = "mirror://sourceforge/guitarix/guitarix2-${version}.tar.xz";
      sha256 = "064k0jzxqgx9gwf8za6jziansabzrwzjaim3qx1743ify5g3gaai";
    };
  
    nativeBuildInputs = [ gettext intltool wrapGAppsHook pkgconfig python2 ];
  
negative.code: , avahi, bluez, boost, eigen, fftw, glib, glib-networking
  , glibmm, gsettings-desktop-schemas, gtkmm2, libjack2
  , ladspaH, libav, librdf, libsndfile, lilv, lv2, serd, sord, sratom
  , wrapGAppsHook, zita-convolver, zita-resampler, curl
  , optimizationSupport ? false # Enable support for native CPU extensions
  }:
  
  