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the Utilities for Implementation- and OS- Portability, formerly known as
asdf/driver, is a Common Lisp portability library and runtime support system
that helps you write Common Lisp software in a portable way.
uiop is distributed as part of ‘ASDF’: its source code is transcluded in the
single-file asdf.lisp being distributed and the precompiled fasls provided by
Lisp implementations. ‘ASDF’ relies heavily on it for its portability layer and
runtime support, particularly so as to handle pathnames and filesystem access.
uiop is useful on its own and can also be compiled and distributed
separately.