WriteMakefile(
#...
    PREREQ_PM => {
        Foo::Bar => 1.02,
        Baz::Quux => 2.70,
        CGI       => 0,
        }
#...
);

##</code><code>##

$ perl -MCGI -le 'print CGI->VERSION' 
3.04

##</code><code>##

$ cpan -D CGI
CGI
---------------------------------------------------------------------
        (no description)
        L/LD/LDS/CGI.pm-3.15.tar.gz
        /usr/local/lib/perl5/5.8.4/CGI.pm
        Installed: 3.04
        CPAN:      3.15  Not up to date
        Lincoln D. Stein (LDS)
        lstein@cshl.org