Setting up Perl on CentOS 6. I'm putting this here because I so that I can find it.
yum install perl cpan # make everything automatic o conf prerequisites_policy follow o conf build_requires_install_policy yes o conf commit q cpan local::lib cpan Bundle::CPAN # keep an eye on this because Realine wants you to hit enter cpan App::cpanminus
Now we can install Imager (say)
sudo yum install giflib-devel libjpeg-devel libpng-devel libtiff-devel freetype-devel t1lib-devel cpanm Imager