how to perl CPAN automatically follow dependencies

Problem: I had 2 computers with a fresh install of cygwin. I wanted to install the perl module XML::TreeBuilder. The issue as I learned on the first one the dependency list stretched longer than SHAQ's wingspan.

Solution:
bash$> export PERL_MM_USE_DEFAULT=1 && perl -MCPAN -e 'install XML::TreeBuilder'

when you come back 20+ minutes later it will be done