john@ubuntu:~/perl-5.10.1$./Configure -des -Dprefix=/opt/perl
john@ubuntu:~/perl-5.10.1$make
john@ubuntu:~/perl-5.10.1$make test
john@ubuntu:~/perl-5.10.1$make install

##</code><code>##

john@ubuntu:~$cd /opt
john@ubuntu:~$sudo mkdir perl
john@ubuntu:~$sudo chmod 777 perl

##</code><code>##

john@ubuntu:~$cd /usr/local/bin
john@ubuntu:~$sudo ln -isv /opt/perl/bin/perl perl

##</code><code>##

john@ubuntu:~$ls -l /usr/local/bin/perl
lrwxrwxrwx 1 root root 18 2010-02-28 10:50 /usr/local/bin/perl -> /opt/perl/bin/perl

##</code><code>##

john@ubuntu:~$/usr/local/bin/perl -e 'print "$]\n";'
5.010001
john@ubuntu:~$/usr/bin/perl -e 'print "$]\n";'
5.008008

##</code><code>##

john@ubuntu:~$perl -e 'print "$]\n";'
5.008008

##</code><code>##

john@ubuntu:~$sudo perl -e 'print "$]\n";'
5.010001

##</code><code>##

john@ubuntu:~$echo $PATH
/usr/local/bin: ... /usr/bin: ...