Add BLE to nrf51822

Hello there, I was looking at the blinky example and wanted to add Bluetooth, and when specifying the bluetooth headers, the compiler wont compile, I tried adding a bluetooth library from URL like this:

But i am not able to do it, is there an easier way to do it?

I am using mbed2 and i think that is the library for mbed5 but I am looking into how to make use of BLE for mbed2


look to right side of the board page - Nordic nRF51822 | Mbed - Example programs

BR, Jan