I see the "desktop linux" tag added.
OpenBSD is not a "linux" distribution/flavor, it is an independent, FREE, multi-platform 4.4BSD-based UNIX-like operating system (https://openbsd.org).
OpenBSD does NOT have a linux compatibility layer such as FreeBSD, i do not know about orion code base and how portable/POSIX it is, nor how portable/POSIX webkit truly is.
But I pray really hard, that you will consider a build and find the resources to provide a build.
Keep it up!