Grab the source code for Perl v5.8.0, unpack it somewhere, then enter these commands:

    cd perl-5.8.0
    cd ext/IO
    perl Makefile.PL
    make test
    make install
[download]

where 'make' might be 'nmake' or such on some fringe operating systems (where, since C code is involved, you'll also need the compiler used to build your distribution of Perl, likely MS VC++).

                - tye