This is to make the scheme more robust to wandering WebKit developers.
Created attachment 268894 [details] Patch
(This patch is only for GTK, but I think the EFL, Mac, and Windows ports should consider adopting this approach to managing build options as well.)
Comment on attachment 268894 [details] Patch Clearing flags on attachment: 268894 Committed r194988: <http://trac.webkit.org/changeset/194988>
All reviewed patches have been landed. Closing bug.