[Bug libstdc++/36231] ostream includes unistd.h outside namespace std, polluting

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36231

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-04-20 
15:17:37 UTC ---
N.B. same issue reported at https://bugzilla.redhat.com/show_bug.cgi?id=502251