GtkClist to cmp.func. If cmp.func is NULL,
then the default compare function is used. The default compare function sorts
ascending or with the type set by gtkCListSetSortType by the column set
by gtkCListSetSortColumn.
WARNING: gtk_clist_set_compare_func is deprecated and should not be used in newly-written code.
gtkCListSetCompareFunc(object, cmp.func)objectGtkCList to affect.cmp.funcGtkCompareFunction to use.