That is the problem.
Searching for the files, gives me this:
$ LANG=C pamac search --files r600_dri.so
/usr/lib32/dri/r600_dri.so is owned by lib32-mesa
/usr/lib/dri/r600_dri.so is owned by mesa
/usr/lib/dri/r600_dri.so is owned by mesa-git
/usr/lib32/dri/r600_dri.so is owned by lib32-mesa-git
$ LANG=C pamac search --files swrast_dri.so
/usr/lib32/dri/kms_swrast_dri.so is owned by lib32-mesa
/usr/lib32/dri/swrast_dri.so is owned by lib32-mesa
/usr/lib/dri/kms_swrast_dri.so is owned by mesa
/usr/lib/dri/swrast_dri.so is owned by mesa
/usr/lib/dri/kms_swrast_dri.so is owned by mesa-git
/usr/lib/dri/swrast_dri.so is owned by mesa-git
/usr/lib32/dri/kms_swrast_dri.so is owned by lib32-mesa-git
/usr/lib32/dri/swrast_dri.so is owned by lib32-mesa-git
But mesa is installed:
Could you check if the files are there?
file /usr/lib/dri/r600_dri.so && file /usr/lib/dri/swrast_dri.so
Reinstalling mesa could help:
pamac install mesa lib32-mesa
Also this:
$ LANG=C pamac search --files --no-aur libLLVM-10.so
/usr/lib/libLLVM-10.so is owned by llvm10-libs
Install this also libLLVM-10.so
:
pamac install llvm10-libs