The following instructions assume that you are using Ubuntu 14.04 or later.

Install prerequisite

sudo apt-get install build-essential git libfftw3-dev cmake libusb-1.0-0-dev

Build and install libairspyhf from IW0HDV fork

cd ~/
git clone https://github.com/IW0HDV/airspyhf.git -b tools
cd airspyhf/
mkdir build
cd build
cmake ../ -DINSTALL_UDEV_RULES=ON
make
sudo make install
sudo ldconfig

Download, build and install csdr library (which is a dependency of OpenWebRX)

git clone https://github.com/simonyiszk/csdr.git
cd ~/csdr
make
sudo make install

Install OpenWebRx

Clone IW0HDV fork, that contains a configuration file suitable for AirSpyHF:

cd ~/
git clone https://github.com/IW0HDV/openwebrx.git -b airspyhf

Run as usual

python openwebrx.py