I fixed the compile problem of xbill.

--- xbill-2.0/Cable.h.orig      Mon Mar 20 19:24:45 2000
+++ xbill-2.0/Cable.h   Mon Mar 20 19:24:54 2000
@@ -13,7 +13,7 @@
        void setup();
        void draw();
        void update();
-       onspark (int locx, int locy);
+       int onspark (int locx, int locy);

 };