>/usr/local/etc/rc.d/010.pgsql.sh initdb
>
>The files belonging to this database system will be owned by user
>"pgsql".
>This user must also own the server process.
>
>The database cluster will be initialized with locale C.
>
>creating directory /usr/local/pgsql/data ... ok
>creating directory /usr/local/pgsql/data/global ... ok
>creating directory /usr/local/pgsql/data/pg_xlog ... ok
>creating directory /usr/local/pgsql/data/pg_xlog/archive_status ... ok
>creating directory /usr/local/pgsql/data/pg_clog ... ok
>creating directory /usr/local/pgsql/data/pg_subtrans ... ok
>creating directory /usr/local/pgsql/data/base ... ok
>creating directory /usr/local/pgsql/data/base/1 ... ok
>creating directory /usr/local/pgsql/data/pg_tblspc ... ok
>selecting default max_connections ... 10
>selecting default shared_buffers ... 50
>creating configuration files ... ok
>creating template1 database in /usr/local/pgsql/data/base/1 ... FATAL:  could not create shared
>memory segment: Function not implemented
>DETAIL:  Failed system call was shmget(key=1, size=1122304, 03600).
>child process exited with exit code 1
>initdb: removing data directory "/usr/local/pgsql/data"
>
>Застрял на 3.1
>Что не так?

пересобери ядро с включением вот этих опций:
options         SYSVSHM
options         SHMMAXPGS=4096
options         SHMSEG=256

...если будет ругаться на симафоры, то добавь и эти
options         SYSVSEM
options         SEMMNI=256
options         SEMMNS=512
options         SEMMNU=256
options         SEMMAP=256