Hello,
There is a small hack in the lexer definition files `scanlt.ll` and `scanaut.ll` which
fails the compilation on my Mac (macOS 12.3 arm64, Clang 13.1.6); they override
`__STDC_VERSION__` which in turn wreaks havoc in the libc includes. I was able to fix the
compilation using this small patch, which includes `libc-config.h` at the top in addition
to `config.h`. I hope it would be useful to you.
Cheers.