in reply to Why does "cpan -r" download new modules?
For further details see recompile at CPAN documentation.
As side note be aware that cpan -r Not::Existing::Module it's bugged: see cpan client problem with strawberry portable and particularly Re^4: cpan client bug in 'r' command? (fixed).
The bug, as you can see in the above threads, has been fixed, even if i dunno if the patched version was already released.
L*
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