Following up on these dablings on installing librespot on a Raspberry Pi, community member @Tony_Reimann kindly referred to RaSpotify (released sometime after the original thread): a fully packaged librespot for the Pi, installable by copying-and-pasting one single line of code.
After installing RaSpotify, your Pi will appear as a Spotify Connect endpoint. It can live in harmony with Roon Bridge (make sure playback has ended on one before switching to the other) on a distribution of choice (DietPi, Raspbian).
All info here: https://github.com/dtcooper/raspotify
You may want to edit the config file to set a different name and to ensure the highest quality stream (320kbps):
Change #DEVICE_NAME=“raspotify” to DEVICE_NAME=“Your-name-of-choice” (remove the #)
Change #BITRATE=“160” to BITRATE=“320” (remove the #)
That’s all – enjoy!