This is a bit weird, I'd expect far more places where the compiler
could complain about Window vs Window64... But it does not.

Screen.c:306:32: warning: passing argument 3 of ‘XQueryTree’ from incompatible pointer type [-Wincompatible-pointer-types]
   if (XQueryTree(d, candidate, &root, &parent, &children, &num_children))
                                ^~~~~
In file included from Screen.c:60:
Agent.h:85:25: note: expected ‘Window64 *’ {aka ‘long unsigned int *’} but argument is of type ‘Window *’ {aka ‘unsigned int *’}
 #define Window          Window64
../../../../exports/include/nx-X11/Xlib.h:3041:5: note: in expansion of macro ‘Window’
     Window*  /* root_return */,