HAVE(FLOAT_H) is meant to guard <float.h> includes. As of now the number of _unguarded_ <float.h> includes is 13; there is only 2 locations where float.h is guarded.
I would proposed to remove the HAVE(FLOAT_H) - as this seems to be a hard dependency for all WebKit components.
Patch will follow.
Created attachment 43498 [details]
Comment on attachment 43498 [details]
Clearing flags on attachment: 43498
Committed r51197: <http://trac.webkit.org/changeset/51197>
All reviewed patches have been landed. Closing bug.