http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48009
--- Comment #1 from Daniel Richard G. <skunk at iskunk dot org> 2011-03-06 22:33:42 UTC --- Editing the strtof() prototype in $top_builddir/gcc/include-fixed/stdlib.h allows the bootstrap to complete successfully. Looks like all this needs is a tweak to fixincludes.