anchor.diff:        qt5.qtbase
       ];
   
  -    buildInputs = [
  +    buildInputs = (overrides.buildInputs or [ ]) ++ [
         avahi
         boost
  +      openssl
         protobuf
       ] ++ optionals (source.qtVersion == 4) [
         qt4
  
positive.code:       alsa-lib
        libopus
        libsndfile
        speex
      ] ++ optionals (source.qtVersion == 5) [
        qt5.qtsvg
      ] ++ optionals jackSupport [
  
negative.code: , libcap
  , libopus
  , libsndfile
  , mesa_noglu
  , qt4
  , qt5
  , openssl
  , protobuf
  , speex
  , xorg
  
  , iceSupport ? true, zeroc_ice
  , jackSupport ? false, jack2_lib
  