~ : sudo port install postgresql83 postgresql83-server
--->  Fetching m4
--->  Attempting to fetch m4-1.4.11.tar.bz2 from http://ftp.gnu.org/gnu/m4
--->  Verifying checksum(s) for m4
--->  Extracting m4
--->  Configuring m4
--->  Building m4 with target all
--->  Staging m4 into destroot
--->  Installing m4 1.4.11_0
--->  Activating m4 1.4.11_0
--->  Cleaning m4
--->  Fetching bison
--->  Attempting to fetch bison-2.3.tar.bz2 from http://ftp.gnu.org/gnu/bison
--->  Verifying checksum(s) for bison
--->  Extracting bison
--->  Configuring bison
--->  Building bison with target all
--->  Staging bison into destroot
--->  Installing bison 2.3_2
--->  Activating bison 2.3_2
--->  Cleaning bison
--->  Fetching libxml2
--->  Attempting to fetch libxml2-2.7.1.tar.gz from ftp://fr.rpmfind.net/pub/libxml/
--->  Verifying checksum(s) for libxml2
--->  Extracting libxml2
--->  Configuring libxml2
--->  Building libxml2 with target all
--->  Staging libxml2 into destroot
--->  Installing libxml2 2.7.1_1
--->  Activating libxml2 2.7.1_1
--->  Cleaning libxml2
--->  Fetching libxslt
--->  Attempting to fetch libxslt-1.1.24.tar.gz from http://distfiles.macports.org/libxslt
--->  Verifying checksum(s) for libxslt
--->  Extracting libxslt
--->  Configuring libxslt
--->  Building libxslt with target all
--->  Staging libxslt into destroot
--->  Installing libxslt 1.1.24_0
--->  Activating libxslt 1.1.24_0
--->  Cleaning libxslt
--->  Fetching ossp-uuid
--->  Attempting to fetch uuid-1.6.1.tar.gz from ftp://ftp.ossp.org/pkg/lib/uuid/
--->  Verifying checksum(s) for ossp-uuid
--->  Extracting ossp-uuid
--->  Applying patches to ossp-uuid
--->  Configuring ossp-uuid
--->  Building ossp-uuid with target all
--->  Staging ossp-uuid into destroot
--->  Installing ossp-uuid 1.6.1_0
--->  Activating ossp-uuid 1.6.1_0
--->  Cleaning ossp-uuid
--->  Fetching postgresql83
--->  Attempting to fetch postgresql-8.3.4.tar.bz2 from http://ftp3.de.postgresql.org/pub/Mirrors/ftp.postgresql.org/source/v8.3.4/
--->  Verifying checksum(s) for postgresql83
--->  Extracting postgresql83
--->  Configuring postgresql83
--->  Building postgresql83
--->  Staging postgresql83 into destroot
--->  Installing postgresql83 8.3.4_0

To use the postgresql server, install the postgresql83-server port
--->  Activating postgresql83 8.3.4_0
--->  Cleaning postgresql83
--->  Fetching postgresql83-server
--->  Verifying checksum(s) for postgresql83-server
--->  Extracting postgresql83-server
--->  Configuring postgresql83-server
--->  Building postgresql83-server with target all
--->  Staging postgresql83-server into destroot
--->  Creating launchd control script
###########################################################
# A startup item has been generated that will aid in
# starting postgresql83-server with launchd. It is disabled
# by default. Execute the following command to start it,
# and to cause it to launch at startup:
#
# sudo launchctl load -w /Library/LaunchDaemons/org.macports.postgresql83-server.plist
###########################################################
--->  Installing postgresql83-server 8.3.4_0

To create a database instance, after install do
 sudo mkdir -p /opt/local/var/db/postgresql83/defaultdb
 sudo chown postgres:postgres /opt/local/var/db/postgresql83/defaultdb
 sudo su postgres -c '/opt/local/lib/postgresql83/bin/initdb -D /opt/local/var/db/postgresql83/defaultdb'

To tweak your DBMS, consider increasing kern.sysv.shmmax by adding an increased kern.sysv.shmmax .. to /etc/sysctl.conf
--->  Activating postgresql83-server 8.3.4_0
--->  Cleaning postgresql83-server