Badly broken ( fatal error ) with any PHP after PHP 5.0.x ( function removed )

If you see something about a fatal error call_time pass_by_reference or some such when attempting to activate mingle with any and all current versions of PHP, ( last few years ) this hack works.
I make no claim that it actually is correct, really fixes the problem, or doesn’t cause other problems, but it worked for me. PHP 5.4.7 WP 3.5.1 and the only version of mingle available. ( ancient )

In plugins/mingle/classes/models/MnglBoardPost.php
change line 19 from
!is_object(&$this_object) )
to
!is_object($this_object) )

In plugins/mingle/classes/models/MnglBoardsHelper.php
change line 11 from
!is_object(&$this_object) )
to
!is_object($this_object) )

The plugin will then activate, and appears to perform normally for the features that I use.
A search for other plugins that provide similar friends lists, members listings, profiles, customizable registration pages, and such has begun…

http://wordpress.org/extend/plugins/mingle/