gfortran compiler compatiblility with what latest macOs version?

It’s possible that someone with Fortran experience might chime in here but, in general, my advice is that, if you have questions about a third-party tool, you ask those via the support channel for that tool.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"