Hi Christian,
Thanks for explaining that, I wasn't aware of the APCu vs APC difference.
I did tinker with the RPi4 and PHP 7.1 a bit, and it was running for the most part, but I found some features were broken. The background DB reporting (cron stuff) and I suspect a few other things weren't working.
I was using version 1.4.0 build, not the latest from git in case that matters.
So far the RPi3 install has been stable and performing quite well for our use. If need arises or time permits, I may have another go at getting a stable install on RPi4. Cheers
Kind regards,
Darian Cabot