Apple released a new version of OS X: 10.11 El Capitan. This version added a new "System Integrity Protection (SIP)" that reduces the attack surface for malware that relies on modifying system files.
We are working on modifying the installer to fix the installation problems in this new OS as soon as possible.
You can follow the next guides if you installed an application before updating to "El Capitan" and you are running into problems with PostgreSQL or Passenger (Ruby on Rails based application).
If you followed the guides above and you continue running into problems with your application, please let us know your issue opening a new topic in our community forum, we'll be glad to help you.
You can learn more about the System Integrity Protection (SIP) using the following link: