libcec4 is missing Raspberry pi support

[Robert Cicconetti]

Possibly related to: ​#1819444 libcec: Please stop linking to GPL-incompatible libraries.

I upgraded my Raspberry Pi 3 from jessie to buster/myth30 to match my mythtv backend. Once I got the dependencies sorted, I found my TV remote control no longer controlled myth-frontend. Testing with cec-client showed no RPi support.

pi@raspberrypi:~ $ cec-client -l
libCEC version: 4.0.4, compiled on Linux-4.4.0-124-generic ... , features: P8_USB, DRM, P8_detect, randr, Exynos, AOCEC
Found devices: NONE

I grabbed the libcec source package from apt, added -DRPI_INCLUDE_DIR=/opt/vc/include -DRPI_LIB_DIR=/opt/vc/lib to debian/rules, built a local package, and installed it, which fixed the problem with mythtv.

pi@raspberrypi:~ $ cec-client -l
libCEC version: 4.0.4, compiled on Linux-4.9.35-v7+ ... , features: P8_USB, DRM, P8_detect, randr, RPi, Exynos, AOCEC
Found devices: 1

device: 1
com port: RPI
vendor id: 2708
product id: 1001
firmware version: 1
type: Raspberry Pi

[Robert Cicconetti (grythumn)]

Looks to be a dupe of Bug #1325212. Sorry.