macro => { INSTALLSITELIB => $Config{installsitearch} }

Thanks hippo - that WriteMakefile() argument does exactly what I want.
And "macro" is a valid argument going all the way back to EU-MM-6.17 (and probably beyond) - so it should certainly suffice for a module that (intentionally) doesn't work on perls older than 5.22.0.

Cheers,
Rob

In reply to Re^4: How to tell EU::MM to install a pure-perl module into an architecture-specific location by syphilis
in thread How to tell EU::MM to install a pure-perl module into an architecture-specific location by syphilis

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