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Relativity currently includes the relativity_views.inc file as:
Unfortunately this causes issues on hosts with security restrictions on paths in the include_path as these directories are scanned first looking for the file. Changing the include_once to use a relative path (to the current working directory, which is gets rid of the issue and saves scanning all the other directories before looking in the current directory:
include_once('./'. drupal_get_path('module', 'relativity') .'/relativity_views.inc');
The attached patch implements this change for the DRUPAL-5 branch.