Install instructions fail: Doctrine Class error

[SphericalBastards]

Hi,

Is there a current recommended method/instructions for installation? It seems some of the doctrine scripts are broken if one follows the current install instructions.

PHP Fatal error: Uncaught Error: Class 'Doctrine\Common\ClassLoader' not found in /opt/rr3/application/libraries/Doctrine.php:29
Stack trace:
#0 /opt/rr3/application/doctrine.php(30): Doctrine->__construct()
#1 /opt/rr3/application/doctrine(5): include('/opt/rr3/applic...')
#2 {main}
thrown in /opt/rr3/application/libraries/Doctrine.php on line 29

Thanks.

[SphericalBastards]

Pinning "doctrine/common" to v2.4.3 in composer.json at least gets past that error.