libcec has spezialized support for the raspberrypi which is enabled by passing --enable-rpi and by setting the --with-rpi-include-path and --with-rpi-lib-path to the correct values. In the ebuild however the raspberry pi support is always disabled. It would be nice to have optional support for the pi in the ebuild.
Created attachment 374236 [details, diff] Add support for raspberrypi to dev-libs/libcec
Good idea. I will try to get my Pi set up over the next weeks to test.
Should be available in 2.2.0, please let me know if you have issues.