There are many ways to access Bluetooth capabilities on Raspberry Pi. Qt has its own API to use Bluetooth and to implement a BLE central device. The last build I provided a few days ago didn't support Bluetooth: this package should support it. I tested the low energy scanner example and it worked properly.
Have fun! Bye ;-)
Download POT 5.1.0 with Qt 5.5.1 for Pi2 Raspbian Jessie here (extraction code: 96aa).