Eager macro-expansion failure: (void-variable flymake-allowed-file-name-masks)

[hexmode]

Seen with

Emacs from git: 9a67540e51e "GNU Emacs 30.0.50 of 2023-09-27"
flymake from git: a55108f

[purcell]

Honestly I'd be surprised if this package still works with recent versions of flymake — I went on a long flycheck excursion during which this wasn't updated for 9 years. These days I'm back on the newer flymake, and I might get around to updating this code at some point.