Unable to write to temporary folder: /tmp/

Unable to write to temporary folder: /tmp/

I use to simply create my own tmp and editing the installer class. $this->_sTempDir = Phpfox::getLib('file')->getTempDir();

What changed in installer.class.php?

I now see only this. It's missing the old Phpfox::getLib('file')->getTempDir();

    /**
     * @var array
     */
    private $_aDefaultApps;

    private $_sTempDir;

    private $_sSessionFile = '';

    private $_hFile = null;

    private $_aOldConfig = [];

    private $_sPage;

    private static $_sSessionId = null;

    private $_sessionPrefix;
 

How do I fix this?

Another milestone in how annoying phpfox can be.

This is on VESTACPANEL.  I'm pretty sure you know about this issue. It is default. Help?