ggplot2 missing dependencies: RColorBrewer, colorspace
It's a bizarre bug with the mac version of R - I've complained about it before but it hasn't been fixed yet.
Complaining is exactly the wrong thing to do - if reported (as David did) it is usually fixed right away...
Well it was described on R-devel with CC to you on 20 August 2007, but I never got a response. Hadley