The indirect object syntax in the import call trips my paranoid-o-meter. If this is appropriately near the beginning of the program, you're probably okay, but it's fraught with enough peril (or, I can never remember all of the rules when it is and isn't okay) that I'd rather write:

BEGIN
{
    my @symbols = qw( carp confess cluck croak fatalsToBrowser );
    if ($ENV{MOD_PERL})
    {
        require CGI::Carp;
        CGI::Carp->import( @symbols, 'fatalsToBrowser' );
    }
    else
    {
        require Carp;
        Carp->import( @symbols );
    }
}
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