Ha-ha! This is what I was looking for. So I can just start the Makefile.PL with a check for an environment variable that disables all the XS, and document the module as supporting this feature. And if I go searching this keyword maybe I'll find existing tooling for it.

In reply to Re^2: How to author a module with optional XS by NERDVANA
in thread How to author a module with optional XS by NERDVANA

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