Split the postgresql ports into a server and a client part. The
following knobs can be used by ports depending on PostgreSQL:
# USE_PGSQL - Add PostgreSQL client dependency.
# If no version is given (by the maintainer via the port or
# by the user via defined variable), try to find the
# currently installed version. Fall back to default if
# necessary (PostgreSQL-7.4 = 74).
# DEFAULT_PGSQL_VER
# - PostgreSQL default version. Can be overridden within a port.
# Default: 74.
# WANT_PGSQL_VER
# - Maintainer can set an arbitrary version of PostgreSQL by
# using it.
# BROKEN_WITH_PGSQL
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