To install your own Perl, follow these steps:

sudo su -
cd /opt
mkdir perl-5.10.1
mkdir src
cd src
wget http://cpan.org/src/perl-5.10.1.tar.gz
tar xzf perl-5.10.1.tar.gz
cd perl-5.10.1
rm -f config.sh Policy.sh
./Configure -Dprefix=/opt/perl-5.10.1
make
make test
make install
cd /opt
ln -s perl-5.10.1 perl
exit
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And you're done. Do not add /opt/perl/bin to your (or root's) $PATH.

To install modules for your own Perl, use /opt/perl/bin/cpanp. Never use /usr/bin/cpanp or /usr/bin/cpan. (To install Perl modules for the system Perl, continue to use aptitude.)

Always use the fully-qualified shebang line at the beginning of scripts that you explicitly want to use /opt/perl/bin/perl:

#!/opt/perl/bin/perl
...
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