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http://sial.org/howto/perl/life-with-cpan/

sudo perl -MCPAN -eshell
cpan> o conf make /usr/bin/make
cpan> o conf commit

cpan> install Getop::Long

...
Appending installation info to /System/Library/Perl/5.8.8/darwin-threa
+d-multi-2level/perllocal.pod
  /usr/bin/make install  -- OK