with both xchat version 2.0.3-r1 and 2.0.4 the executable is /usr/bin/xchat-2 not sure if this should be a menu tweak or an xchat tweak, but unless there's an executable (or link to xchat-2) called /usr/bin/xchat then the menu generation apps like commonbox-menugen or mmaker (menumaker) will not pick up xchat as available in the system.
*** This bug has been marked as a duplicate of 26289 ***