The editors/openoffice-3 port requires the serf library. Its Makefile explicitly requires version 1.0.
The www/serf port provides version 1.3, not 1.0. Therefore, openoffice-3 does not build.
Fix: Changing the depend from "serf-1.0" to "serf-1" in /usr/ports/editors/openoffice-3 seems to allow compiling the port:
$ cd /usr/ports/editors/openoffice-3 && svn diff
How-To-Repeat: cd /usr/ports/editors/openoffice-3 && make
Over to maintainer (via the GNATS Auto Assign Tool)
openoffice-3 is not available anymore.
All efforts are focused on openoffice-4 now.