This is very unusual for the host to not allow safe mode to be disabled, according to the php documentation in php 5 this is deprecated and will not be available in php 6:
Safe Mode is deprecated in PHP 5.3.0 and is removed in PHP 6.0.0.
When the open basedir restriction is in effect you can only include files that are within the location specified in this setting. It looks like it may be the temp file in your webroot that is allowed:
To know for sure you can create a php info page by adding this line of code to the top of any php page:
<?php phpinfo(); ?>
Look for the setting here, it is open_basedir. You should see the allowed paths in here, you will need to put any of the files that you want to include in here and adjust the paths accordingly.