geoPHP Class name 'WKT' conflicts with PostGIS 'Wkt' class

When I try to load the geoPHP library, this is the error I get:

PHP Fatal error: Cannot redeclare class WKT in /var/www/sites/all/modules/geophp/geoPHP/lib/adapters/WKT.class.php on line 247

This is conflicting with:
profiles/cartaro/modules/contrib/postgis/includes/postgis.geometry.inc:class Wkt

Who's responsibility is it to ensure there are no class name conflicts?
What should I do to work around this?