I am not exactly sure what you were doing. Were you trying to use the -current port with a -release or -stable system? If so, you don't report your troubles anyone, as this is unsupported per FAQ 15.4.1.
If you have a problem with the -current port on a -
current system, then the most helpful thing would work up a patch and submit it to the port maintainer:
$ cd /usr/ports/net/openvpn
$ make show=MAINTAINER
Patches are most easily worked up with cvs(1) diff. Be sure to use diff(1)'s -u operand, as unified diffs are used for OpenBSD maintenance.
If you cannot work up a patch, you can still contact the port maintainer with questions or concerns ... as long as you are running a supported environment. If you don't get a response from the maintainer after a reasonable period of time, you can post to the ports@ mailing list.