Keeps source trees up-to-date just by applying the patch files provided en passant by the syspatch(8) utility.
For further information, please have a look at the manpage.
If you are running OpenBSD-current, installing srcpatch is not supported as it strongly depends on the syspatch(8) utility which solely works on official releases. Hence, this is a development-only branch that is used to follow the ongoing OpenBSD development process.
In case you are running an official release, though, one of the following branches might suit your needs: