Package: ftp.debian.org Severity: normal src:julia has been FTBFS for long time. It's dependency llvm-9 has been removed for a while. Upgrading to newer version of src:julia leads to a million embedded artifacts that requires heavy patchword. Nobody has stepped forward and take over this package. The package is not in bad shape. And should not be kept in debian.
For future contributors who want to bring this back ... please first investigate how many external files are needed during the build through download / srccache. Then estimate the amount of work. Thank you for using reportbug [1] https://lists.debian.org/debian-science/2022/05/msg00017.html