> Kawa is Java based. I'd assume the build process is standardized
> (didn't test though, don't want to install Java)

Kawa's build is described in the manual:
<https://www.gnu.org/software/kawa/Source-distribution.html>. Looks like
it's just the standard autotools:

./configure
make
make install

I did `grep` and `git ls-files` through the Kawa repo and found only one
mention of bootstrapping. It's for GCJ which is no longer up to date.

Wikipedia says GCJ "was part of the GNU Compiler Collection for over ten
years but as of 2017 it is no longer maintained and will not be part of
future releases." (https://en.wikipedia.org/wiki/GNU_Compiler_for_Java)