tvl-depot/third_party/lisp/asdf-flv/README.md

ASDF-FLV provides support for file-local variables through ASDF. A file-local variable behaves like *PACKAGE* and *READTABLE* with respect to LOAD and COMPILE-FILE: a new dynamic binding is created before processing the file, so that any modification to the variable essentially becomes file-local.

In order to make one or several variables file-local, use the macros SET-FILE-LOCAL-VARIABLE(S).