How to use the local::lib module:

Use the --bootstrap method to install local::lib according to its installation instructions and then

echo 'eval $(perl -I$HOME/perl5/lib/perl5 -Mlocal::lib)' >>~/.bashrc

then run cpan shell this way

perl -MCPAN -Mlocal::lib -e shell

you may need to
cpan> reload cpan
cpan> o conf init connect_to_internet_ok urllist

cpan> install Crypt::Rijndael  # for example