+BINARY COMPATIBILITY
+ If you upgrade your kernel to a greater version than 2.3.23 on i386 or
+ 2.3.48 on any other platform, you will need to rebuild the module to
+ access the extended fields.
+
+ Moreover, since the perl hash function has changed after the 5.6
+ version, you will also need to recompile the module if you upgrade your
+ perl from a version earlier than 5.6.
+