UHD version problem

[wangzhanwei666]

OpenBTS-UMTS can't support UHD3.15.0, can support UHD3.9.LTS, so cann't use ppa source, like below:
sudo add-apt-repository ppa:ettusresearch/uhd
sudo apt-get update
sudo apt-get install libuhd-dev libuhd3.15.0 uhd-host

if you want to use UHD，just use UHD3.9.LTS, and build it from source code, like below
sudo apt-get -y install libboost-all-dev libusb-1.0-0-dev python-mako doxygen python-docutils cmake build-essential
cd uhd/host
mkdir build
cd build
cmake ../
make
make install
ldconfig