在Ubuntu 14.10上安装psycopg2

在这里完成新手操作，尝试将Django设置为与PostgreSQL一起使用。我正在使用Ubuntu 14.10，并且还安装了PostgreSQL 9.5。在终端中
运行时pip install psycopg2，出现以下错误：

Collecting psycopg2
Using cached psycopg2-2.6.1.tar.gz
Complete output from command python setup.py egg_info:
running egg_info
creating pip-egg-info/psycopg2.egg-info
writing pip-egg-info/psycopg2.egg-info/PKG-INFO
writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt

writing manifest file 'pip-egg-info/psycopg2.egg-info/SOURCES.txt'
warning: manifest_maker: standard file '-c' not found

Error: pg_config executable not found.

Please add the directory containing pg_config to the PATH
or specify the full executable path with the option:

    python setup.py build_ext --pg-config /path/to/pg_config build ...

or with the pg_config option in 'setup.cfg'.

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-la8dJp/psycopg2

我知道包含pg_config的目录是，/opt/PostgreSQL/9.5/bin/pg_config但是我不知道如何将该目录添加到PATH来安装我的psycopg2。或安装psycopg2的任何其他方法，以便我可以与PostgreSQL进行交互。

预先感谢您。