I tried to install with the instruction and ports by Martin Matuska. Things seems to be fine but I do get the error and could not get the Openacs system running:
Errot: ...."libpq.so.3" not found, required by 'nspostgres.so"
This error happens if you upgrade PostgreSQL e.g. from 7.4 to 8.x and forget to reinstall aolserver-nspostgres. The library ending changes in this case. Please reinstall databases/aolserver-nspostgres