installman3dir='/home/desantis/perl64root/perl/man/man3';
installsiteman3dir='/home/tdesantis/perl64root/perl/man/man3';
                          ^
                          |
here ---------------------+
[download]

Glitch in your config. Quick fix: create the symbolic link

ln -s desantis /home/tdesantis
[download]

but that's a hack. Start over and configure properly :-)

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}