No POD found for 22_pid_pack_unpack.t. Time to read the source?
22_pid_pack_unpack.t
To install Data::MessagePack, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Data::MessagePack
CPAN shell
perl -MCPAN -e shell install Data::MessagePack
For more information on module installation, please visit the detailed CPAN module installation guide.