anchor.diff:          --setenv LOCAL_ADDRESS="$LOCAL_ADDRESS" \
           --setenv HOST_ADDRESS6="$HOST_ADDRESS6" \
           --setenv LOCAL_ADDRESS6="$LOCAL_ADDRESS6" \
  +        --setenv HOST_PORT="$HOST_PORT" \
           --setenv PATH="$PATH" \
           ${if cfg.additionalCapabilities != null && cfg.additionalCapabilities != [] then
             ''--capability="${concatStringsSep " " cfg.additionalCapabilities}"'' else ""
  
positive.code:       '';
      };
  
      hostAddress = mkOption {
        type = types.nullOr types.str;
        default = null;
  
negative.code:               ${optionalString (cfg.hostBridge != null) ''
                  HOST_BRIDGE=${cfg.hostBridge}
                ''}
                ${optionalString (cfg.hostPort != null) ''
                  HOST_PORT=${cfg.hostPort}
                ''}
                ${optionalString (cfg.hostAddress != null) ''
                  HOST_ADDRESS=${cfg.hostAddress}
                ''}
  