[zxwrt]

I agree that disabling will-be-posix extensions in POSIX mode sounds like an extreme idea, but seriously, such strictness is the main point of the pdpmake. It ensures that implementation conform to the current standard, not draft which may change quite often.

[hvdijk]

It turns out it's actually pdpmake-build-time-configurable. If you build with -DENABLE_FEATURE_MAKE_EXTENSIONS -DENABLE_FEATURE_MAKE_POSIX_202X, extensions are enabled by default, and .POSIX only flags non-POSIX-202x extensions. I don't know what, if anything, this says about the main point of pdpmake, but I'm glad with this mode.