anchor.diff:  , fetchgit
   , fetchurl
   , python2
  +, which
   
   , alsa-lib
   , avahi
   , boost
  +, grpc
   , ice
   , jack2_lib
   , libcap
  
positive.code:     xorg.libXi
      xorg.xproto
    ] ++ optionals (config == "murmur") [
      ice
      libcap
    ];
  
negative.code:         inherit (source) sha256;
        };
  
    nativeBuildInputs = optionals (config == "mumble") [
      python2
      qt4
      qt5
    ] ++ optionals (config == "murmur") [
      which
    ];
  
    buildInputs = [
  