The use of Makefile.PL in ext/[1] provides a well-established way to instruct how to build them. This is why modules with binary components are in ext/ and not lib/.

  1. This is what was called "CPAN-like", but isn't really because the directories here don't have any of the other files that CPAN wants.

In reply to Re^2: The perl source directory structure by ikegami
in thread The perl source directory structure by syphilis

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