@itemize
@item
This function is missing on some platforms:
-MacOS X 10.5, FreeBSD 6.4, Minix 3.1.8, IRIX 5.3, Solaris 2.4, mingw, Interix 3.5, BeOS, Tandem/NSK.
+MacOS X 10.5, FreeBSD 6.4, Minix 3.1.8, IRIX 5.3, Solaris 2.4, mingw, MSVC 9, Interix 3.5, BeOS, Tandem/NSK.
+@item
+This function fails with @code{ENOSYS} on some platforms:
+OpenBSD 4.9.
@end itemize