anchor.diff:      "${boolNo (qt5 == null)}qt4-legacy-compat"
     ] ++ optionals (config == "murmur") [
       "${boolNo (ice != null)}ice"
  -    # TODO: grpc support, protoc-gen-grpc not found
  -    "no-grpc"
  +    "${boolNo (grpc != null)}grpc"
       "qssldiffiehellmanparameters"
     ];
   
  
positive.code: , fetchgit
  , fetchurl
  , python2
  
  , alsa-lib
  , avahi
  , boost
  , ice
  , jack2_lib
  , libcap
  
negative.code:     xorg.libXi
      xorg.xproto
    ] ++ optionals (config == "murmur") [
      grpc
      ice
      libcap
    ];
  