Stuff broke when moving things from WebCore/GNUmakefile.am to GNUmakefile.am. There's a) a typo b) FEATURE_DEFINES wasn't moved so it's not seen.
Created attachment 65412 [details] featuredefines.diff
Comment on attachment 65412 [details] featuredefines.diff Sorry for the bustage. LGTM!
Comment on attachment 65412 [details] featuredefines.diff Landed as r66021.
Closing the bug.