You can try setting the PERL_MM_USE_DEFAULT environment to a true value. It helps with some prompts in Makefile.PL scripts, I'm not sure it helps with yours.
Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: Getting CPAN.pm to accept Makefile.PL prompts by moritz
in thread Getting CPAN.pm to accept Makefile.PL prompts by syphilis

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