How to update a NetBSD 1.3 source tree to 1.3.1 This assumes you have an existing NetBSD 1.3 source tree. If you do not, download and extract the NetBSD 1.3 source from this site. 1) download netbsd-1.3-1.3.1.diff.gz. 2) cd to the base of your source tree (typically /usr/src). 3) run 'gzcat netbsd-1.3-1.3.1.diff.gz | patch -p1 -s'. If you only have the kernel sources online (from syssrc.tgz), follow the above directions but with netbsd-1.3-1.3.1.sys.diff.gz