a.wsgi:
    import sys
    import site
    sys.path.insert(0, '/home/user/app')
    site.addsitedir('/home/user/app:/<my_python_path>/Lib/site-packages')
    from app import app as application

httpd.conf:
    <VirtualHost *:80>
       ServerName app.<mydomain>:80
        WSGIDaemonProcess app python-path=/var/www/cgi-bin/app:/<my_python_path>/Lib/site-packages user=user1 group=user1 threads=5
        WSGIScriptAlias /cgi-bin/app /var/www/cgi-bin/app/a.wsgi
        <Directory /var/www/cgi-bin/app>
            WSGIProcessGroup app
            WSGIApplicationGroup %{GLOBAL}
            Order deny,allow
            Allow from all
        </Directory>
        ErrorLog /home/user/app/logs/error.log
        CustomLog  /home/user/app/logs/custom.log combined
    </VirtualHost>