Looking for a make (gmake?) installation in Mac OS I came across macports.

itacoatiara-2:~ jfaleiro$ sudo port -d selfupdate
sudo: port: command not found

Despite of what the documentation says, seems like the shell environment is not set properly and the selfupdate command is not executed in the post-install. Try this:

itacoatiara-2:~ jfaleiro$ env | grep SHELL
SHELL=/bin/bash

If you are using bash, create a file .bash_profile on your home directory (or add to it if you already have it) with the following content:

export PATH=$PATH:/opt/local/bin
export MANPATH=$MANPATH:/opt/local/share/man
export INFOPATH=$INFOPATH:/opt/local/share/info

This is there as well, just in case you missed it in a first pass…