Phalcon install on openbsd

There are support for FreeBSD but I don't know if are compatible. Instalation docs

https://github.com/phalcon/docs/blob/3.4/en/installation.md/#freebsd

Have you tried adding a port?

I see it looks like well maintained: https://www.freebsd.org/cgi/ports.cgi?query=phalcon&stype=all

So your best bet for OpenBSD is to contact the maintainer in case you cannot use ports.

But really bottomline is - same as with Windows IMHO: just use VM / container and run full-fledged GNU/Linux distro.