How to rebuild gr-osmosdr on Raspbian Stretch

1) Install libusb-dev
sudo apt-get install libusb-1.0-0-dev

2) Update swig
sudo apt-get install swig				// should offer to install swig 3.0

3) Rebuild rtl-sdr with latest version
sudo apt-get remove librtlsdr-dev
sudo apt-get remove rtl-sdr				// rtl_test should NOT work after this
cd ~\apps
git clone git://git.osmocom.org/rtl-sdr.git
cd rtl-sdr
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig
rtl_test -h								// should show version and show -T option
rtl_test								// should discover and transfer

4) Rebuild gr-osmosdr with latest version
sudo apt-get remove gr-osmosdr			// grc should NOT show rtl-sdr source after this
cd ~\apps
git clone git://git.osmocom.org/gr-osmosdr.git
cd gr-osmosdr
mkdir build
cd build
cmake ..								// check list of included devices
make
sudo make install
sudo ldconfig							// grc should show rtl-sdr source after this