[Bug libstdc++/13207] <iostream> header and _XOPEN_SOURCE=500

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-11-26 22:12 -------
The real problem is that acosl is included in C99 (and not C89) so the headers at the point they 
were made thought that acosl is an extension to POSIX (aka UNIX) which is not true any more so it 
still is a problem with your vender, report is to them.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13207