You use the patch program. If you had scrolled down on the same page you got the patch you'd have seen

[guest - Thu Feb  7 14:58:24 2002]:

> Due to changes in the PERL XS variable naming scheme (presumed to ha
+ve
>    happened with 5.6),
> several changes to the typemap and API.xs files are needed to build
>    perldap with perl v5.6.1.
>
> The attached patch provides those fixes and the result has been
>    successfully tested both with
> the test package provided as well as against several current LDAP
>    servers I have access to.
>
> --Kurt Andersen

This patch needs s/NA/na/g to work properly. Apply like this if you
don't know already.

# patch -l -i patch.1
patching file typemap
patching file API.xs
#
[download]

update: Didn't notice the date (Wed Jul 7 23:59:21 2004 ) on that comment, I guess it wasn't there before. Good work tachyon.