anchor.diff:      cp util/mup2mma.py $out/bin/mup2mma
       cp util/pg2mma.py $out/bin/pg2mma
       cp util/synthsplit.py $out/bin/mma-synthsplit
  -    cp -r {docs,egs,includes,lib,MMA,text} $out/share/mma
  -    rmdir $out/share/mma/includes/aria
  +    cp -r {docs,egs,includes,lib,MMA,text,plugins} $out/share/mma
   
       cp util/README.* $out/share/mma/docs
       mv $out/share/mma/docs/man/mma-libdoc.8 $out/share/man/man8
  
positive.code: { lib, stdenv, fetchurl, makeWrapper, python3, alsa-utils, timidity }:
  
    stdenv.mkDerivation rec {
    version = "20.12";
    pname = "mma";
  
    src = fetchurl {
      url = "https://www.mellowood.ca/mma/mma-bin-${version}.tar.gz";
      sha256 = "18k0hwlqky5x4y461fxmw77gvz7z8jyrvxicrqphsgvwwinzy732";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  
negative.code:   '';
  
    meta = {
      description =
        "Creates MIDI tracks for a soloist to perform over from a user supplied file containing chords";
      homepage = "https://www.mellowood.ca/mma/index.html";
      license = lib.licenses.gpl2;
      maintainers = [ lib.maintainers.magnetophon ];
      platforms = lib.platforms.linux;
  