Latest Macs use zsh shell.
Many solutions to adding to the path involve updating the .bash_profile file for bash shell.

I found this to be the simplest solution:

It turns out there is a very neat way to do this in OS X, the /etc/paths file!  The file contains a list (one per line) of paths that are added to the $PATH variable in the shell. Here are some quick directions to add to the path:

• Open up Terminal.
• Run the following command:sudo nano /etc/paths
• Enter your password, when prompted.
• Go to the bottom of the file, and enter the path you wish to add.
• Hit control-x to quit.
• Enter “Y” to save the modified buffer.
• That’s it!  To test it, in new terminal window, type:echo $PATH