Also appears to be possible to override via http://docs.activestate.com/activeperl/5.20/lib/ActivePerl/Config.html#Windows-overrides

Looks outdated to me.
It says "The value of $Config{cc} will be cl by default" but perl -V:cc says "undef" on my ActivePerl-5.20.0.
There's also the claim that $Config{make} "will be nmake by default", whereas it's actually "dmake".
And the focus of that documentation is on replacing 'cl' values with 'gcc' ones, instead of the other way round (as per the op's requirements).

Cheers,
Rob

In reply to Re^5: Change make/compiler by syphilis
in thread Activestate Perl 5.20, Change make/compiler by d.ra.ke

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