Centos 5 with Perl 5.10.0 ConfigDefs.pl "strict refs" error

[Nathan Olson]

Perhaps related to this change from 5.10.

strictures and dereferencing in defined()

use strict 'refs' was ignoring taking a hard reference in an argument
to defined(), as in :

    use strict 'refs';
    my $x = 'foo';
    if (defined $$x) {...}

This now correctly produces the run-time error Can't use string as a
SCALAR ref while "strict refs" in use.

defined @$foo and defined %$bar are now also subject to strict 'refs'
(that is, $foo and $bar shall be proper references there.)
(defined(@foo) and defined(%bar) are discouraged constructs anyway.)
(Nicholas Clark)