Failed build on MacOS X (gnulib->openat->fchmodat)

[Ben Abbott]

libtool: compile:  gcc-4.2 -DHAVE_CONFIG_H -I. -I.. -I/sw/lib/flex/include 
-I/sw/include -g -m32 -I/sw/include/freetype2 -I/sw/include/qhull 
-I/usr/include -I/sw/include -I/sw/include -g -m32 -D_THREAD_SAFE -MT 
fchmodat.lo -MD -MP -MF .deps/fchmodat.Tpo -c fchmodat.c  -fno-common -DPIC -o 
.libs/fchmodat.o
In file included from fchmodat.c:55:
at-func.c:65: error: conflicting types for ‘fchmodat’
at-func.c:65: note: an argument type that has a default promotion can’t match 
an empty parameter name list declaration
openat.h:77: error: previous implicit declaration of ‘fchmodat’ was here
make[4]: *** [fchmodat.lo] Error 1
make[3]: *** [all-recursive] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

I'm don't recognize where this problem was introduced. Maybe one of the 
changesets below?

        http://hg.savannah.gnu.org/hgweb/octave/rev/65b41bc71f09

        http://hg.savannah.gnu.org/hgweb/octave/rev/2d47356a7a1a

Ben