The Unicon 10. beta package for AMD64 OpenBSD 4.0 does not completely build.
(Dies just after creating the unicon binary).
There is a brand new version of Unicon (version 11.4 updated 1/10/2007) at
unicon.org.
The configure for the new version has an openbsd option. The configure
completes, but it does not set extra includes properly, so after the apparently
successful configure, the unicon build for openbsd dies almost immediately as a
result of not finding jpeglib.h and jerror.h which are in fact in
/usr/local/include.