Cross compiler for Linux

I maintain a few Internet dynamic pages that run on Scheme, mostly in
Racket. I would like to use Bigloo instead of Racket, since the runtime is
much smaller. The server works on Cent OS Linux. I develop the programs on
a Macintosh with the Catalina OSX. Therefore, I need a cross compiler for
Bigloo on MacOSx to Linux. The documentation explains how to build such a
compiler, but I keep failing in follow the instructions. I wonder whether
somebody could give me the exact steps.

By the way, I already installed the x86_64-linux-musl-gcc and it is already
working with other languages, such as femtolisp and Nim. Thank you for the
help.