Sadly, its a known issue

https://rt.cpan.org/Public/Dist/Display.html?Name=Ruby

Bug #61013 for Ruby: not work on win32 systems

Bug #56261 for Ruby: Tests fail with perl 5.12.0

In reply to Re: trouble installing CPAN module "Ruby" by Anonymous Monk
in thread trouble installing CPAN module "Ruby" by technojosh

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