calendar (cal) in OS X

I am hoping to run some of the commands listed in this article, e.g.:

cal -3

which is supposed to show me the last month, this month, and next month.

This command does not work in OS X:

$ cal -3
cal: illegal option -- 3
usage: cal [-jy] [[month] year]
       cal [-j] [-m month] [year]
       ncal [-Jjpwy] [-s country_code] [[month] year]
       ncal [-Jeo] [year]

For reference:

$ which cal
/usr/bin/cal

and

$ man cal 

reveals that this is probably the default OS X version: "...BSD General Commands Manual..."