% perl -MCPAN -e shell
cpan> install CGI::Session::Serialize::yaml
% perl Makefile.PL
% make
% make test
% make install
If you don't have proper permissions to perform system-wide installations you can install CGI::Session::Serialize::yaml to your private PERL5LIB folder:
% perl Makefile.PL LIB=~/perllib
% make
% make test
% make install
These commands install CGI::Session::Serialize::yaml to your ~/perllib folder.
See the INSTALL document in the CGI::Session distro.