How to increase font size in Rattle interface

[Roger Bohn]

I am using Rattle for in-class demonstrations, and the font size  is rather small for our classroom layout. I'm on a Mac, so everything is displayed through the X11 system. I could not find information on how to change the font or font size in X11, but that is probably due to my ignorance of Unix.

Has anyone had success with changing the fonts in the Rattle displays, either on Windows or Mac? 

Thanks.