How should I install more than one version of Perl?
I want to install, from source, Perl versions 5.005, v5.6, v5.8, v5.10
Right now I have 'v5.10.0' installed.
/opt/perl/bin /opt/perl/html /opt/perl/lib /opt/perl/man /opt/perl/lib/5.10.0 /opt/perl/lib/site_perl /opt/perl/lib/site_perl/5.10.0
Will I have any problems if I install them all in /opt/perl?
Or should I split them up into their own, version specific, directories? Like /opt/perl-5.10.0/
Answer
I install all of my perls completely in their own directory so they don't share anything with any other perl. To do that, you just tell the Configure script where to install everything. I like /usr/local/perls:
% ./Configure -des -Dprefix=/usr/local/perls/perl-5.x.y
When I do that for multiple versions, I get a directory that has separate installations.
% ls -1 /usr/local/perls perl-5.10.0 perl-5.10.1 perl-5.6.2 perl-5.8.8
They all have their own bin and lib directories:
% ls -1 /usr/local/perls/perl-5.10.0 bin lib man
Most of the common tools will figure out what to do if you call them with different perls:
/usr/local/perls/perl-5.10.0/bin/perl /usr/local/bin/cpan
However, you can take the perl you want to use the most and put it first in your path. I just make a symlink to /usr/local/bin/perl, but you can add directories to PATH as well.
The perlbrew does a lot of this for you and moves symlinks around to make one of them the default perl. I don't use it though because it doesn't make life easier for me. That's up to you decide on your own though.