The OS is managed entirely separately from the Ports and Packages system, Milo.
Read FAQ 5.
The OS is source-code maintained. You are expected to know which flavor of OpenBSD you wish to run (typically, -release + errata or -stable), how to obtain the proper source code for your flavor of the OS), and how to build and install a new GENERIC kernel. You should also know how to build the complete userland, though, if you elect to use -release + errata, userland patches will usually come with individual instructions. Lastly, if you use the X Windows system, you should know how to rebuild OpenBSD's implementation of X.Org's X11R6 software, called xenocara. We are unlikely to see errata for xenocara, but it might happen.
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