anchor.diff:  
   stdenv.mkDerivation rec {
     name = "guitarix-${version}";
  -  version = "0.37.1";
  +  version = "0.37.3";
   
     src = fetchurl {
       url = "mirror://sourceforge/guitarix/guitarix2-${version}.tar.xz";
  -    sha256 = "064k0jzxqgx9gwf8za6jziansabzrwzjaim3qx1743ify5g3gaai";
  +    sha256 = "1wfm8wrwrnqpb4ihy75n7l9i6vml536jlq9pdx2pblbc4ba3paac";
     };
   
     nativeBuildInputs = [ gettext intltool wrapGAppsHook pkgconfig python2 ];
  
positive.code:     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
    ];
  
    configureFlags = [
  
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
  }:
  
  