Cactus' build system driver (CST) is written in Perl but does not use strict or warnings meaning that variables do not have to be explicitly declared and many issues (such as using == instead of eq) are silently handled in unexpected ways.

This has led to a number of bugs being introduced in the past due to misspelled variables etc.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2456/use-perl-strict-and-warnings-in-cst