I had a similar problem when a CentOS 5.6 instance upgraded its perl
version via a yum update.   I managed to get rid of the "OIO::Code
error: Cannot use 'pure perl' version of Scalar::Util - 'weaken'
missing" by forcing CPAN to compile the latest module (cpan force
install Scalar::Util) after installing native OS code versions (yum
install perl-Class-InsideOut perl-Scalar-Defer).
  _peter (Peter Dimitrios, petedag...@gmail.com and peterdimitr...@computer.org)

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