[R] Telling tcltk where tcl is?

[Bjørn-Helge Mevik]

The installation of R I'm using (R 1.2.0 on Redhat Linux
(R-base-1.2.0-2.i386.rpm)) apparently expects to find tcl in
./share/tcl8.0, ./share/tcl8.0 or /usr/local/share/tcl8.0:

> library (tcltk)
Error in firstlib(which.lib.loc, package) : 
	Can't find a usable init.tcl in the following directories: 
    ./share/tcl8.0 ./share/tcl8.0 /usr/local/share/tcl8.0

However, tcl is installed in /usr/lib/tcl8.0 on my machine.  Is there a way
to tell R or tcltk where tcl is located?

(I'm sorry if this is a faq -- I've gone through all documentation I've
found, but I still couldn't find out about it.)

-- 
Bjørn-Helge Mevik  <bhm at math.uio.no>
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