--- xemacs-21.5.27.20060705.orig/src/select-x.c	2007-02-16 12:42:44.000000000 +0100
+++ xemacs-21.5.27.20060705/src/select-x.c	2007-02-16 16:09:32.000000000 +0100
@@ -1048,7 +1048,10 @@
       return;
     }
 
-  total_size = bytes_remaining + 1;
+  if (sizeof(long) == 8 && *actual_format_ret == 32)
+    total_size = 2 * bytes_remaining + 1;
+  else
+    total_size = bytes_remaining + 1;
   *data_ret = xnew_rawbytes (total_size);
 
   /* Now read, until we've gotten it all. */
--- xemacs/src/select-x.c-dist	2007-02-15 01:49:41.000000000 +0100
+++ xemacs/src/select-x.c	2007-02-15 03:09:54.000000000 +0100
@@ -1072,7 +1074,13 @@ x_get_window_property (Display *display,
 	 reading it.  Deal with that, I guess....
        */
       if (result != Success) break;
-      *actual_size_ret *= *actual_format_ret / 8;
+      /* What a mess, XGetWindowProperty() returns "long" array on LP64
+	 even if format == 32...
+       */
+      if (sizeof(long) == 8 && *actual_format_ret == 32)
+	*actual_size_ret *= 8;
+      else
+	*actual_size_ret *= *actual_format_ret / 8;
       memcpy ((*data_ret) + offset, tmp_data, *actual_size_ret);
       offset += *actual_size_ret;
       XFree ((char *) tmp_data);