Manfred

I was able to compile ist with VS2015 by adding the following code at the top of gnss-sdrgui.cpp ``` FILE _iob[] = { *stdin, *stdout, *stderr }; extern "C" FILE...

In the v2 image from (https://github.com/jpmeijers/ttn-resin-gateway-rpi.git) there already was a env variable GW_GPS_PORT so this would be a good name for compatibility.