anchor.diff:      mock
       magic-wormhole-transit-relay
       magic-wormhole-mailbox-server
  -    twisted
  +    pytestCheckHook
     ];
   
     postPatch = lib.optionalString stdenv.isLinux ''
  
positive.code: , mock
  , magic-wormhole-transit-relay
  , magic-wormhole-mailbox-server
  }:
  
  buildPythonPackage rec {
  
negative.code:     install -Dm644 docs/wormhole.1 $out/share/man/man1/wormhole.1
    '';
  
    meta = with lib; {
      description = "Securely transfer data between computers";
      homepage = "https://github.com/magic-wormhole/magic-wormhole";
  