cl-global-vars binary package in Ubuntu Jammy amd64

 In Common Lisp, a special variable that is never dynamically bound typically
 serves as a stand-in for a global variable. This library provides true global
 variables that are implemented by some compilers. An attempt to rebind a
 global variable properly results in a compiler error. That is, a global
 variable cannot be dynamically bound.
 .
 Global variables therefore allow one to communicate an intended usage that
 differs from special variables. Global variables are also more efficient than
 special variables, especially in the presence of threads.

Source package