If you do not have the Command Line Developer Tools installed, run $ xcode-select --install to install them.
Install lzip and xz from source (1, 2), your favorite package manager (Homebrew, MacPorts, etc), or Rudix
$ sudo perl -MCPAN -e shell
cpan[1]> install grepmail
cpan[2]> exit
If, like me, you receive a "command not found" error when attempting to run grepmail, repeat steps 2-4 to resolve.
/mac | Jul 06, 2016