https://wiki.archlinux.org/index.php/PostgreSQL
http://eax.me/postgresql-install/

inst-lin:
http://www.unixmen.com/install-postgresql-9-3-centos-6-56-4/
http://www.unixmen.com/install-postgresql-9-3-phppgadmin-centos-6-5/
http://www.unixmen.com/install-postgresql-9-3-phppgadmin-centos-76-56-4/
http://www.unixmen.com/postgresql-9-4-released-install-centos-7/

http://stackoverflow.com/questions/15301826/psql-fatal-role-postgres-does-not-exist/

manjaro-extra:
    postgresql
    postgresql-libs (psql, createdb and other stuff)
    postgresql-docs
aur:
    postgresql-lts
    postgresql-9.4
    postgresql-beta[-docs]
    postgresql-git

sudo -u postgres initdb /var/lib/postgres/data
### su -l postgres -c 'initdb --locale en_US.UTF-8 -E UTF8 -D /var/lib/postgres/data'
...
WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success. You can now start the database server using:

    pg_ctl -D /var/lib/postgres/data/ -l logfile start

sudo -u postgres createuser --superuser $USER
createuser -s -U $USER

cfg:
/usr/lib/systemd/system/postgresql.service
...
Environment=PGROOT=/var/lib/postgres

postgres-owned:
/var/lib/posgres/data/postgresql.conf
/var/lib/posgres/data/pg_hba.conf