xinitrc startup default

Hello,

I need to ensure that some extra fonts are loaded upon starting X11 (Snow Leopard on Macbook) to view a Mathematica session over NX.

I'm able to use "xset fp+ /pathtofonts; xset fp rehash" and this properly loads the fonts, however, I'd like for this to happen when X11 starts. I've tried putting this in /usr/X11/lib/X11/xinit/xinitrc, and I've tried copying xinitrc to ~/.xinitrc and adding those lines in near the bottom. I've even tried putting them near the top, but regardless of what I do, this script does not appear to be run upon X11 startup.

Am I missing something? Is there another default X startup script somewhere?

Thanks,
Drew