[Observium] rrdtool_info() redeclared issue

I am installing observium for the first time and getting a fatal error:

[root@agsappl01 observium]# php -l includes/rrdtool.inc.php

PHP Fatal error: Cannot redeclare rrdtool_info() in includes/rrdtool.inc.php on line 334

Fatal error: Cannot redeclare rrdtool_info() in includes/rrdtool.inc.php on line 334

Errors parsing includes/rrdtool.inc.php

I am at svn revision 4313

To install, I had to comment out

include_once($config['install_dir'] . "/includes/rrdtool.inc.php");

in includes/functions.php