http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50982 --- Comment #35 from David Edelsohn <dje at gcc dot gnu.org> 2011-11-05 15:54:45 UTC --- And the single set of braces appears to be an AIX header bug. But it is not fixed in any later AIX releases through AIX 7.1. I suspect this will require fixincludes magic.