anchor.diff:    buildInputs = [
       xorg.libX11 xorg.libXcomposite xorg.libXcursor xorg.libXext
       xorg.libXinerama xorg.libXrender xorg.libXrandr
  -    freetype alsa-lib curl libjack2 pkg-config libGLU libGL lv2
  +    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
  
positive.code:         Simple arpeggiator
          Effects: Formant filter, stutter, delay
      '';
      license = lib.licenses.gpl3;
      maintainers = [ maintainers.magnetophon ];
      platforms = platforms.linux;
    };
  
negative.code: 
    prePatch = ''
      sed -i 's|usr/||g' Makefile
      sed -i "s|/usr/share/|$out/share/|" src/common/load_save.cpp
    '';
  
    meta = with lib; {
  