Please add the documentation on what prevents the clang compiler

[yurivict]

This line says that clang is not supported: https://github.com/rumpkernel/rumprun/blob/master/build-rr.sh#L307

You need to write the document on why it isn't supported. On FreeBSD, for example, clang is the default compiler. Every once in a while it is ok to use gcc, if bug reports have been filed against clang. The clang team is very forthcoming in fixing them.

Could you please elaborate what is breaking with clang?

Thanks,
Yuri