xmaxima won't start on freshly installed Fedora5

Hi!

I have freshly installed Fedora 5.

I have installed through "yum" 
maxima and the maxima-gui (xmaxima)
package from the Fedora5 repository.
"yum" should also take care of installing
dependent packages.

If I type:
xmaxima

I get:
/usr/bin/xmaxima: line 3: exec: wish: not found

I cannot find any package in the Fedora5 repository
called "wish" or anything similar.

What should I do to get xmaxima to work?

   Fabrizio