At least some build issues were introduced r256892 / bug #207048
Created attachment 410633 [details] Very WIP Patch Patch with a couple of fixes, I expect that more work is needed.
Created attachment 410979 [details] Patch
Committed r268350: <https://trac.webkit.org/changeset/268350> All reviewed patches have been landed. Closing bug and clearing flags on attachment 410979 [details].
<rdar://problem/70206062>
*** Bug 208523 has been marked as a duplicate of this bug. ***
*** Bug 216602 has been marked as a duplicate of this bug. ***