[Bug libstdc++/40974] [4.9/5/6 Regression] cannot build gcc-4.4.1: fenv_t has not been declared

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974

--- Comment #60 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Is anyone still seeing this with 4.9.3 or later?