I've been trying to get this to work for a couple days now... and just figured it out. Anyway:
Go into YaST and then the "Install and remove programs" module. Use the search option, type in "dev" and near the bottom there should be an "XFree86-devel" package. Install it. Now you can get on with the rest of the imwheel installation.
This should be helpful too:
http://www.linuxquestions.org/questi...imouse+optical
STuPiDiCuS