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A popular feature added to ASDF was output pathname translation:
asdf-binary-locations, common-lisp-controller,
cl-launch and other hacks were all implementing it in ways
both mutually incompatible and difficult to configure.
Output pathname translation is essential to share source directories of portable systems across multiple implementations or variants thereof, or source directories of shared installations of systems across multiple users, or combinations of the above.
In ASDF 2, a standard mechanism is provided for that,
asdf-output-translations,
with sensible defaults, adequate configuration languages,
a coherent set of configuration files and hooks,
and support for non-Unix platforms.