Hi, A user of my LLA library asked for more flexibility in specifying which foreign library to load. For example, BLAS/LAPACK come in so many variants that it is impossible to cover them with the :or feature of cffi:define-foreign-library, especially because users have their own preferences when more than one is available. I am looking for a portable way to specify configuration for a library before/during loading with ASDF2. It would be sufficient if the user could specify an ALIST (or something similar) somewhere and I could read/ use it when the library is loaded. Does ASDF2 have a "standard" mechanism for library config files (eg where they are, how to handle them etc), or should I use something else? I thought of using *features*, but I need actual values instead of merely checking for the presence of symbols. Any suggestions are welcome. Thanks, Tamas