New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/24097#issuecomment-680448482

Comment:
I know llvm10 support is "in progress" for julia but not yet officially supported. Void no longer ships llvm9 so that doesn't bring any advantage. I'm not *too* worried about "official" support status at the moment, since we're also building packages for musl and they call that "tier 3" which seems to mean "it may or not compile". Well, it definitely compiles in all of our cases.

Even if you can't find a compelling reason to build their patched llvm9, we can always revbump and drop USE_SYSTEM_LLVM when we see the first issue report.