This question is relevant for my work to develop a new package PeriodicSystems, where I am relying on a compiled Fortran library SLICOT for which a binary wrapper has been created by the courtesy of Ralph Smith. While version 5.7 of the library worked for Julia 1.7 and apparently, “by miracle” also on the nightly version (i.e., Julia 1.8), the last version 5.8 works only with Julia 1.7 (see #4969 ). Apparently maintaining compatibility of Fortran libraries with several Julia versions is not automatically supported, so for any new version of Julia new wrappers should be included (a not very straightforward fix would be as proposed in #4770). It would be nice to have this process automated, since in this moment I am really stuck in version 1.7 of Julia.