I want to use
\definefontfamily, and according to contextgarden.net, it should be included by default:
As of December 2013, the functionality of the Simplefonts module has been included into the ConTeXt core. You do no longer need to load any external module to take advantage of the simplified font commands. However, the commands have slightly changed: \setmainfont is now \definefontfamily [myfamily] [serif] [DejaVu] (and the same syntax to set the sans, mono and math font). To use this family: \setupbodyfont [myfamily]
I am using Mac OS X, and I used TeX Live to update to the latest version of Context. However, it breaks when I try (undefined control sequence):
\definefontfamily[mainface][serif][Adobe Garamond Pro] \starttext test \stoptext
\usemodule [simplefonts] \setmainfont [Adobe Garamond Pro] %\definefontfamily[mainface][serif][Adobe Garamond Pro] \starttext test \stoptext
What do I have to do? I am VERY new to Context.