Hello. I'm trying to run OpenCL on Raspberry Pi Zero with Raspbian (Debian Buster). I know that the library was not designed for Zero, but since this guy claimed it worked for him, I decided to give it a try. So here is what I discovered:

1. VC4CL cannot be built on latest Raspbian, because it doesn't have /opt/vc/. Not sure if it is supposed to be there or they moved it to other place.
2. Latest version of VC4C throws unexpected reloc type 0x03 error. Could be fixed with '-DCMAKE_CXX_FLAGS=-fPIC'.
3. VC4CL commit with "stable" tag cannot be compiled: Program.cpp needs Optional.h but can't find it. Can be fixed easily.
4. TestVC4CL from 2021/09/14 passes only 36.6% of tests.
5. After playing with /opt/vc/bin/container_test I discovered that now TestVC4CL passes 54% of tests.

Could you please comment this situation?
Even if it doesn't work for me, you do a great job. Thank you.