anchor.diff:  { stdenv
   , fetchurl
   , fetchgit
  +, python
   
   , alsa-lib
   , avahi
  
positive.code:       pulseaudio_lib
      ];
  
      configureFlags = [
        "CONFIG+=no-server"
      ];
  
negative.code: 
    client = source: generic {
      type = "mumble";
  
      nativeBuildInputs = [
        python
      ];
  
      buildInputs = [
        alsa-lib
  