in the spec file there is a BuildRequires: nautilus >= 2.5.4 which should have to be BuildRequires: nautilus-devel >= 2.5.4 otherwise it can't be build in mock.
*** Bug 253900 has been marked as a duplicate of this bug. ***
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2009-1483.html