[SOLVED] Adding a directory globally to cffi:*foreign-library-directories*

Adding a directory globally to cffi:*foreign-library-directories*

I am using the Nix package manager under macOS to install much of my software, including dynamic libraries. And I would like to make them accessible to CFFI. That means adding a path to cffi:*foreign-library-directories*. Fine, but how can I do this

globally for my system (should work for packages loaded via Quicklisp, for example)
without loading CFFI every time I start sbcl?

Ignoring the second criterion, I can just add a few lines to ~/.sbclrc:

(ql:quickload "CFFI")
(pushnew (merge-pathnames ".nix-profile/lib/" (user-homedir-pathname))
         cffi:*foreign-library-directories*
         :test #'equal)

What I am looking for is a way to add the path after CFFI is loaded. A bit like eval-after-load in Emacs Lisp. Is that possible?

Solution

I think that you should try to use the mechanisms of the underlying system instead, i. e. on Linux ldconfig (resp. ld.so.conf), on MacOS DYLD_LIBRARY_PATH. The CFFI manual says that the *foreign-library-directories* are only used as a fallback if the system mechanism fails.