Where are being these set?

I currently have:

$ echo $XDG_CONFIG_DIRS
/etc/xdg

$ echo $XDG_DATA_DIRS
/usr/local/share:/usr/share

I'm asking because although Enlightenment-17 picks up the kde menu from there, 
it does not seem to recognise the respective application icons.  If I set the 
icons manually with absolute paths (e.g. 
/usr/share/icons/oxygen/48x48/apps/knode.png, instead of the generic 
knode.png) then I end up with duplicate menu entries for each application when 
I launch kde.
-- 
Regards,
Mick