Call to undefined function views_get_view()

not sure where i should post this, its for the code in CVS, you might know about this error already

[warn] PHP Fatal error: Call to undefined function views_get_view() in ./sites/all/modules/openx_manager/openx_manager.publisher.inc on line 258
[warn] PHP Fatal error: Call to undefined function views_get_view() in ./sites/all/modules/openx_manager/openx_manager.advertiser.inc on line 284
should check for views module presence or make it a dependency for the module