People are downgrading to the Tiger version of X11 in droves. The  
XDarwin developer
(Ben Byer) has posted an unofficial upgrade to Xquartz for Leopard.  
There
will probably be more at the same address. As for R, I can compile R- 
devel just
fine with both gcc-4.2.1 and icc. Both from Terminal.app and from  
R.app I can
start X11() -- although my default device is quartz() in both. You  
need to patch
LDFLAGS for OpenGL and tcltk (and Rcmdr and so on) becomes a WMD.  
LDFLAGS needs
to contain

"-Wl,-dylib_file,/System/Library/Frameworks/OpenGL.framework/Versions/ 
A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/ 
Versions/A/Libraries/libGL.dylib"

and the updated Xquartz is at

> git revision history: http://gitweb.freedesktop.org/?p=xorg/xserver.git;a=log;h=xorg-server-1.2-apple
> source tarball: xorg-server-1.2a2.tar.bz2
> Xquartz binary: Xquartz-1.2a2.bz2
>
> You can install the binary with something like:
> $ cd /tmp
> $ curl -LO http://people.freedesktop.org/~bbyer/x11app/xorg-server-1.2a2/Xquartz-1.2.0a2.bz2
> $ bunzip2 Xquartz-1.2a2.bz2
> $ sudo mv /usr/X11/bin/Xquartz /usr/X11/bin/Xquartz.old
> $ sudo cp Xquartz-1.2a2 /usr/X11/bin/Xquartz

In general, clearly Apple does not devote many resources to non-Apple  
technologies
such as X11 and Java -- which makes sense. Even though their valuation  
is now
higher than IBM and Intel, and twice that of Dell, they are still a  
relatively small company
with only 20,000 employees, instead of 200,000, and they invest almost  
all their software
energies in Cocoa, the essential OS X and Darwin components, and iLife/ 
iWork.
===
Jan de Leeuw; Distinguished Professor and Chair, UCLA Department of  
Statistics;
Director: UCLA Center for Environmental Statistics (CES);
Editor: Journal of Multivariate Analysis, Journal of Statistical  
Software;
US mail: 8125 Math Sciences Bldg, Box 951554, Los Angeles, CA 90095-1554
phone (310)-825-9550;  fax (310)-206-5658;  email: deleeuw@stat.ucla.edu
.mac: jdeleeuw +++ skype: j_deleeuw +++ homepage: http://www.cuddyvalley.org
   
-------------------------------------------------------------------------------------------------
           No matter where you go, there you are. --- Buckaroo Banzai
                    http://gifi.stat.ucla.edu/sounds/nomatter.au
   
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