well then of course it does not work ...
2.4.2 does not support gtk2, because it will leak mem even worse then 2.5.5 and it makes amule really unstable because of wxWidgets problems with gtk2
you have to get or compile yourself 2.5.5 with gtk2 support in, otherwise you cannot compile amule with gtk2,
amule will ALWAY use what wx is compiled with!!