anchor.diff:            "Set timeout in seconds after which response will be requested.";
         };
   
  +      sendEnv = mkOption {
  +        type = types.listOf types.str;
  +        default = [];
  +        description = ''
  +          Environment variables to send from the local host to the
  +          server.
  +        '';
  +      };
  +
         compression = mkOption {
           type = types.nullOr types.bool;
           default = null;
  
positive.code:       default = false;
        type = types.bool;
        description = ''
          Whether connection to authentication agent (if any) will be forwarded
          to remote machine.
        '';
      };
  
  
negative.code:   cfg = config.programs.ssh;
  
    yn = flag: if flag then "yes" else "no";
  
    unwords = builtins.concatStringsSep " ";
  
    matchBlockModule = types.submodule ({ name, ... }: {
      options = {
  