by stevepusser » 2020-08-07 05:24
A newer Mesa usually needs other backports first, such as libva, libdrm, etc., so I hope you're prepared for that. Bullseye's says it also requires llvm-10 for the build, and it and llvm-9 aren't in backports. I think you can tell mesa to use llvm-8 instead, which is in backports, but I don't know if you're losing any features with 8.
You should know that the llvm toolchains are very lengthy builds, and always fail for us MX packagers in pbuilder, but succeed using sbuild instead. We haven't tried builds in virtual machines or real installs--those are last resorts for us now.
MX Linux packager and developer