Aha, apparently http://strawberryperl.com/release-notes/5.16.1.1-64bit.html MSI installer sets up those two env vars in the registry

I don't understand why they didn't use sitecustomize for this purpose

In reply to Re^3: perl.exe Makefile.PL fails to create makefile ( PERL_JSON_BACKEND / registry / sitecustomize) by Anonymous Monk
in thread perl.exe Makefile.PL fails to create makefile by agentsmith

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