/usr/include/OGRE/Plugins/PCZSceneManager/ is in libogre-1.9-dev 1.9.0+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/OGRE/Plugins/PCZSceneManager/OgreAntiPortal.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgreCapsule.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgreDefaultZone.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCPlane.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZCamera.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZFrustum.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZLight.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZPlugin.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZPrerequisites.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZSceneManager.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZSceneNode.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZSceneQuery.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZone.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePCZoneFactory.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePortal.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgrePortalBase.h
/usr/include/OGRE/Plugins/PCZSceneManager/OgreSegment.h