so the new version of amule needs wxWidgets 2.8 
Not true. If you want, compile wx2.6.3 yourself do not use the library that comes with the distribution.
BUT...
wx-2.6.3 has a bug. aMule will probably crash when you close the search window. In any other situation, aMule is rock stable with wx-2.6.3.
I hope all goes well now.