[gradsusr] How to install Grads in macOS Sierra

[Eduardo Agosta Scarel]

Hi Grads users.
I had to move to another country for three years.
I am an usual user of Grads for Windows. It happens now that this is my first time I find myself working on a Mac.
Some things looks like under Linux, but find things a bit different.

Can someone help me how to install Grads on Mac running under IOS XI (Sierra)?

Thanks in advance for any help in this sense.
Edu.