Introduction Memorandum for myself. I just follow these three articles. Thanks dude. http://undeadly.org/cgi?action=article&sid=20130109210346 http://www.onlamp.com/pub/a/bsd/2003/10/09/adding_system_calls.html http://www.openbsd.org/faq/faq5.html#BldGetSrc Prolly This's the easiest way to try kernel hack. I tried with OpenBSD 5.6 How to install OpenBSD on QEMU http://undeadly.org/cgi?action=artic