anchor.diff:  
   stdenv.mkDerivation rec {
     name = "muse-sequencer-${version}";
  -  version = "3.0.2";
  +  version = "3.1pre1";
   
     meta = with stdenv.lib; {
       homepage = http://www.muse-sequencer.org;
  
positive.code:     lash
      dssi
      liblo
      pkgconfig
      gitAndTools.gitFull
    ];
  
    sourceRoot = "source/muse3";
  
negative.code:     fetchFromGitHub {
        owner = "muse-sequencer";
        repo = "muse";
        rev = "2167ae053c16a633d8377acdb1debaac10932838";
        sha256 = "0rsdx8lvcbz5bapnjvypw8h8bq587s9z8cf2znqrk6ah38s6fsrf";
      };
  
  
    nativeBuildInputs = [
      pkgconfig
      gitAndTools.gitFull
    ];
  
    buildInputs = [
      libjack2
  