gistfile1.sh

ricardoduarte ~ $ sudo brew install postgresql
==> Downloading ftp://ftp.ossp.org/pkg/lib/uuid/uuid-1.6.2.tar.gz
######################################################################## 100,0%
==> ./configure --disable-debug --without-perl --without-php --without-pgsql --p
==> make
==> make install
/usr/local/Cellar/ossp-uuid/1.6.2: 11 files, 364K, built in 17 seconds
==> Downloading http://ftp9.us.postgresql.org/pub/mirrors/postgresql/source/v9.0
######################################################################## 100,0%
==> ./configure --disable-debug --prefix=/usr/local/Cellar/postgresql/9.0.1 --en
==> make install
==> cd contrib/adminpack; make install
==> cd contrib/dblink; make install
==> cd contrib/fuzzystrmatch; make install
==> cd contrib/lo; make install
==> cd contrib/uuid-ossp; make install
==> cd contrib/pg_buffercache; make install
==> cd contrib/pg_trgm; make install
==> cd contrib/pgcrypto; make install
==> cd contrib/tsearch2; make install
==> cd contrib/vacuumlo; make install
==> cd contrib/xml2; make install
==> cd contrib/intarray; make install
==> cd contrib/pg_upgrade; make install
==> cd contrib/pg_upgrade_support; make install
==> cd contrib/hstore; make install
==> Caveats
To build plpython against a specific Python, set PYTHON prior to brewing:
  PYTHON=/usr/local/bin/python  brew install postgresql
See:
  http://www.postgresql.org/docs/9.0/static/install-procedure.html


If this is your first install, create a database with:
    initdb /usr/local/var/postgres

If this is your first install, automatically load on login with:
    cp /usr/local/Cellar/postgresql/9.0.1/org.postgresql.postgres.plist ~/Library/LaunchAgents
    launchctl load -w ~/Library/LaunchAgents/org.postgresql.postgres.plist

If this is an upgrade and you already have the org.postgresql.postgres.plist loaded:
    launchctl unload -w ~/Library/LaunchAgents/org.postgresql.postgres.plist
    cp /usr/local/Cellar/postgresql/9.0.1/org.postgresql.postgres.plist ~/Library/LaunchAgents
    launchctl load -w ~/Library/LaunchAgents/org.postgresql.postgres.plist

Or start manually with:
    pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

And stop with:
    pg_ctl -D /usr/local/var/postgres stop -s -m fast

If you want to install the postgres gem, including ARCHFLAGS is recommended:
    env ARCHFLAGS="-arch x86_64" gem install postgres

To install gems without sudo, see the Homebrew wiki.
==> Summary
/usr/local/Cellar/postgresql/9.0.1: 1220 files, 20M, built in 3.6 minutes

gistfile2.sh

ricardoduarte ~ $ initdb /usr/local/var/postgres
The files belonging to this database system will be owned by user "ricardoduarte".
This user must also own the server process.

The database cluster will be initialized with locale pt_BR.UTF-8.
The default database encoding has accordingly been set to UTF8.
The default text search configuration will be set to "portuguese".

creating directory /usr/local/var/postgres ... ok
creating subdirectories ... ok
selecting default max_connections ... 20
selecting default shared_buffers ... 2400kB
creating configuration files ... ok
creating template1 database in /usr/local/var/postgres/base/1 ... ok
initializing pg_authid ... ok
initializing dependencies ... ok
creating system views ... ok
loading system objects' descriptions ... ok
creating conversions ... ok
creating dictionaries ... ok
setting privileges on built-in objects ... ok
creating information schema ... ok
loading PL/pgSQL server-side language ... ok
vacuuming database template1 ... ok
copying template1 to template0 ... ok
copying template1 to postgres ... ok

WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the -A option the
next time you run initdb.

Success. You can now start the database server using:

    postgres -D /usr/local/var/postgres
or
    pg_ctl -D /usr/local/var/postgres -l logfile start

gistfile3.sh

ricardoduarte ~ $ sudo gem install pg
Building native extensions.  This could take a while...
Successfully installed pg-0.9.0
1 gem installed
Installing ri documentation for pg-0.9.0...
Installing RDoc documentation for pg-0.9.0...

gistfile4.sh

ricardoduarte ~ $ psql  postgres
psql (9.0.1)
Type "help" for help.

postgres=# CREATE USER postgres SUPERUSER;
CREATE ROLE
postgres=# CREATE DATABASE gtagestor_development OWNER postgres;
CREATE DATABASE
postgres=# ALTER ROLE postgres WITH PASSWORD 'postgres';
ALTER ROLE
postgres=# \q

gistfile5.sh

ricardoduarte ~ $ pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
server starting