[R] tcltk problem

[Dina Said]

Hi,

I'm using fedora core 3. I downloaded R and installed it. 
 After that, I invoked R by the root user and write the 
 command install.packages("Rcmdr", dependencies=TRUE). This 
 command installs Rcmdr automatically. However, whenever I 
type library(Rcmdr), it tells me that Loading required 
 package: tcltk Error in firstlib(which.lib.loc, package) :
         Tcl/Tk support is not available on this system
 Error: package 'tcltk' could not be loaded
 

tcl and tk are installed on my system

The problem is that R can't find them as I guess

Please help me to solve this problem