Yay! I managed to make XCVB create executable programs with ECL,
as well as SBCL, CCL, CLISP, LispWorks Pro, CMUCL.
On ECL, it requires the fix that I posted a few hours ago.
At that point, I'm interested in starting to pitch XCVB
to adventurous Lisp hackers. Maybe even as a way to build ECL itself?
For the latter, I might first have to port XCVB so it runs on ECL.