[El] Missing dependencies

[Mathieu Baudier]

>> Just an idea: did you try whether it is working when using the TCL/Tk interface?
>
> Yes, it will.

As confirmed by Micha it does, I updated the wiki accordingly

> PS: Please consider to use the new RC7 (maybe you do)
>  http://grass.osgeo.org/grass64/source/grass-6.4.0RC7.tar.gz
>  http://grass.osgeo.org/grass64/source/grass-6.4.0RC7.md5sum

I assume that it contains the wxPython UI fix that we tested on
revision 43144 of the 6.4 release branch and which is available in
elgis-testing.

I'll package RC7 as soon as I'm back at my desk after FOSS4G.
I guess we can then push it fairly quickly to elgis (stable).