The supported way to install Oracle Portal is available in Note [url https://support.oracle.com/epmos/faces/DocContentDisplay?id=1436807.1]1436807.1, 'How to Perform a New Installation of Oracle Portal 11g With Oracle Access Management 11g as Single Sign-On Solution ?'.
A few remarks about this note :
<li>The note mentions FMW 22.214.171.124 - FMW 126.96.36.199 is out already and should be used instead
<li> The note mentions OAM 188.8.131.52 - use OAM 11.1.2 instead as it will allow you to consume a future patch for DAS support