Hmm.. wxGTK shouldn't be needing *tif at all. Are you sure you are compiling the GTK2 version of wx and not wxMotif? Use the --with-gtk=2 option with configure to force the toolkit.
Also, you should look over your other configure flags too. You need unicode support in wx for aMule and AFAIK wx doesn't support anything but GTK2 for unicode (and says so during configure).