installing Tcl/Tk 8.5.5 for X11 on Mountain Lion

Dear Simon,

I received an email recently from a user trying to install the Rcmdr package
under OS X 10.8 (Mountain Lion). It materialized that he was unable to
install Tcl/Tk 8.5.5 from the R for Mac OS X Development Tools and Libraries
page because his security settings didn't permit installation of software
from "unidentified" developers. The problem was solved by resetting this
option temporarily. 

I notice that the R Mac OS X binary itself is now signed to circumvent the
problem, and wonder whether the same thing can be done for the Tcl/Tk that's
provided -- or if not whether instructions for proceeding in Mountain Lion
can be added to the web page. Depending on how the issue is resolved, I may
add an instruction to the Rcmdr Mac installation notes.

Thanks,
 John

-----------------------------------------------
John Fox
Senator McMaster Professor of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada