Hi, All I'v found that directory /usr/include/linux includes some files that not included by directory <include/linux> of kernel source, why is that? Do some other programs put headers in directory /usr/include/linux? Thanks, Regards, Cheng -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/