1.023: compile files the modern ASDF way, with various hooks (around-compile,

external-format, *compile-op-compile-file-function*, compile-flags).
For that, depend on ASDF 2.21 or later (2.23 or later preferred).
Also, override any with-compilation-unit when compiling in a fork.
If that causes warnings you don't like to be emitted...
use asdf-condition-control.