What version are you using. The current MQTT gateway code states:
#define RADIO_CE_PIN 5 // radio chip enable
#define RADIO_SPI_SS_PIN 6 // radio SPI serial select
#define RADIO_ERROR_LED_PIN 7 // Error led pin
#define RADIO_RX_LED_PIN 8 // Receive led pin
#define RADIO_TX_LED_PIN 9 // the PCB, on board LED*/
This works for me (sorry for the large font size, came from cut-and-paste from the Arduino code and I have found no way of changing it.)
