sudo apt-get build-dep freerdp2-shadow-x11
sudo apt-get install ninja-build
sudo apt install libpam0g-dev # might be unnecessary?
git clone https://github.com/FreeRDP/FreeRDP/
cd FreeRDP/
cmake -GNinja -DWITH_SERVER=ON
cmake --build .
./server/shadow/freerdp-shadow-cli
xfreerdp /v:[hostname] /u:[username] /p:[password]
# if you don't specify credentials, the connection will fail
# without prompting you for anything!