Mwheel works fine in Emacs21, but not working in Xemacs21

[Ronald van Engelen <ronalde@xs4all.nl>]

Hi, 
when I try to use the mouse wheel in Xemacs21 (tried gnome/mule and
other variants) I get a button4 not defined error. However in other X
apps and even in Emacs it works just fine.

Thanks for your help,
Ronald van Engelen

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