question on installing perl modules

Hi.

This is not directly a question on mod_perl, apologies.
But I figure that there should be the required expertise on this list to which I am 
subscribed.

My problem : I am trying to install a CPAN module, from CPAN, into a "custom" location 
rather than the system perl locations.
This is a hpux system where I have no root access, and in this case the specific module is 
XML::SAX.
I did what is indicated in the perldoc of CPAN.pm (FAQ section), namely set

o conf makepl_arg "LIB=~/myperl/lib \
                     INSTALLMAN1DIR=~/myperl/man/man1 \
                     INSTALLMAN3DIR=~/myperl/man/man3 \
                     INSTALLSCRIPT=~/myperl/bin \
                     INSTALLBIN=~/myperl/bin"

  and it seems to be doing what I want, except that it insists on trying to install the 
documentation in "/opt/perl32/man/man3", to which I do not have write permissions.
Therefore it breaks down at the install step, and does not install.

Am I forgetting something ? is there something inaccurate or outdated in the above ? is 
there a way to get past it ?

Thanks in advance for any tips