@ISA and @EXPORT_OK are should be globals; the lexical variables @ISA and @EXPORT_OK are different variables and do not influence Exporter.

doing 

our @ISA = qw(Exporter);

our @EXPORT_OK = qw(
                        $cat
                        $cleartool
                        $chkconfig
                ) ;

[download]
will fix the problem
"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: How to correctly import variables to a module ? by Joost
in thread How to correctly import variables to a module ? by ronbarak

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