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$ perl -w Makefile.PL
Checking if your kit is complete...
...

You do not have Scalar::Util::weaken, cannot continue, aborting.
# Looks like your test died before it could output anything.

$ perl -MCPAN -e shell

...
Going to read /db2/dlink/.cpan/Metadata
  Database was generated on Tue, 13 Dec 2005 01:06:49 GMT
Scalar::Util is up to date.

$ perl -MScalar::Util -e 'print $Scalar::Util::VERSION'
1.18

$ perl -v

...

$ oslevel
5.2.0.0