anchor.diff:          Simple arpeggiator
           Effects: Formant filter, stutter, delay
       '';
  -    license = lib.licenses.gpl3;
  +    license = lib.licenses.gpl3Plus;
       maintainers = [ maintainers.magnetophon ];
       platforms = platforms.linux;
     };
  
positive.code: 
    prePatch = ''
      sed -i 's|usr/||g' Makefile
    '';
  
    buildPhase = ''
      make lv2
      make standalone
    '';
  
    installPhase = ''
     make DESTDIR="$out" install
    '';
  
    meta = with lib; {
  
negative.code:   buildInputs = [
      xorg.libX11 xorg.libXcomposite xorg.libXcursor xorg.libXext
      xorg.libXinerama xorg.libXrender xorg.libXrandr
      freetype alsa-lib curl libjack2 libGLU libGL lv2
    ];
    nativeBuildInputs = [ pkg-config ];
  
    CXXFLAGS = "-DHAVE_LROUND";
    enableParallelBuilding = true;
    makeFlags = [ "DESTDIR=$(out)" ];
  
    patches = [
      # gcc9 compatibility https://github.com/mtytel/helm/pull/233
  