Some of you may have seen that I've uploaded an update to port:openal-soft to trac, bringing the port to the current v1.18.1 . I've also filed a ticket for a build conflict in Qt5's QtMultiMedia component, which is supposed to build against the system OpenAL.framework but which picks up $prefix/lib/libopenal.dylib if it is present, which is probably not a very good idea.
At the same time, openal-soft's configuration utility uses Qt5. My proposed upgrade makes building it optional but it's still a considerable cost if you need it but don't have any other use for Qt5.
As to port:openal, it looks to be severely outdated and I don't get the impression that the official openal.org ships the sources for even the version I have in my OS X 10.9 OpenAL.framework .
Currently, the portfiles below contain port:openal or port:openal-soft :