Patches for the OpenBSD base system are distributed as unified diffs. Each patch contains usage instructions. All the following patches are also available in one tar.gz file for convenience.
Patches for supported releases are also incorporated into the -stable branch.
# pkg_add https://ftp.openbsd.org/pub/OpenBSD/3.4/packages/i386
It should instead read:
# pkg_add https://ftp.openbsd.org/pub/OpenBSD/3.4/packages/i386/
The extra / at the end is important. We do not make patch files available for things printed on paper.