Marpa is a Raku interface to the libmarpa C library.
Marpa requires libmarpa to be present. I'd recommend installing from packages, or just look on the libmarpa website for install instructions.
Using zef (a module management tool bundled with Rakudo Star):
zef install Marpa
To run tests:
prove -e raku
Jeffrey Goff, DrForr on #raku, https://github.com/drforr/
Artistic License 2.0