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Undefined subroutine &CPAAN::shell called at /usr/bin/cpan line 198.

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If you really, really are sure that CPAAN::shell is not a typo, go to line 198 of /usr/bin/cpan and change CPAAN to CPAN. You, or somebody else already manually changed things around on this machine. You shouldn't do that with things in /usr/bin. Also consider installing your own Perl, or using the Fedora package manager (rpm?) to install Perl modules into the Fedora system Perl.

Also see:

In reply to Re: CPAN fails from Fedora 10 by Corion
in thread CPAN fails from Fedora 10 by taj

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