When WebKitEnumTypes.h was added to the list of installed headers, I inadvertently added a circular dependency for its generation.
Created attachment 221056 [details] Patch
Comment on attachment 221056 [details] Patch Looks sane to me.
Comment on attachment 221056 [details] Patch Clearing flags on attachment: 221056 Committed r161919: <http://trac.webkit.org/changeset/161919>
All reviewed patches have been landed. Closing bug.