Welcome to the ActiveState Platform! Thanks for bringing this to our attention. Our engineers will investigate and report back on their findings.
In the meantime, if you are able to use llvmlite v0.38.0 (the previous release), I have confirmed that it will build successfully for Python 3.9.12 on Windows 10.
I just change the version of llvmlite to 0.38.0 as recommended and the build succeeded. Assuming that this version is compatible with the other dependencies we can use it just fine.