[R-SIG-Mac] R and XDarwin -- should tcltk still work?

[David Firth]

This is a question about running R in an X-windows environment on the 
Mac.

I haven't yet "upgraded" to Apple's X11, and am still using the 
Xfree86/XDarwin setup, which worked fine with R up to and including 
1.7.1.

With the new R 1.8.0 (the binary RAqua from CRAN), though, I get the 
following problem:

 > library(tcltk)
 > kCGErrorIllegalArgument : CGSGetWindowType: Invalid window
kCGErrorIllegalArgument : CGSGetWindowType: Invalid window

Is this because R now tries to draw Aqua-based Tk windows rather than 
X11 ones?  or something else?  I'd welcome any hints before I spend 
time experimenting.

Thanks,
David