The cpan program and the ppm program are two different things., The cpan program installs modules directly from CPAN, while the ppm program only installs things that have been precompiled and prepackaged by (for example) ActiveState.

You haven't told us how the installation fails for you. If you tell us how the installation via cpan fails for you, that helps us to help you better.

In reply to Re^3: Install Module from CPAN by Corion
in thread Install Module from CPAN by Bintuch

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