The error message is the clue. You've got conflicting mismatching files. Either get rid of them (delete/overwrite), or install to a different location, or call the right perl binary ($PATH), or sanitize your environment variables (PERLLIB/PERL5LIB).

In reply to Re^3: Trouble installing DBD::Pg by Anonymous Monk
in thread Trouble installing DBD::Pg by frankdew

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