Undefined subroutine &Scalar::Util::weaken

0John TE Slade • 1st Jan 2012 • Programming, Perl

Ever had the problem in Perl:

Undefined subroutine &Scalar::Util::weaken called at

This is caused by a version of Scalar::Util that is perl only and doesn’t implement the weaken function (ref).  To install the XS version of Scalar::Util use cpan and run:

force install Scalar::Util