Intel/AMD or Via x86 processors are supported by either the i386 or amd64 ports (..sometimes both), if you installed OpenBSD/i386, you must use packages compiled for that architecture.
You can confirm which architecture you're using via the
uname(1) command:
$ uname -m
Please note; that the error you're seeing is likely related to the fact that you have not installed the appropriate X sets.. which many ports rely on for additional libraries (..freetype in this case).
See
http://www.openbsd.org/faq/faq4.html#AddFileSet for more information about that.