+@item
+This function is missing on some platforms:
+MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11,
+IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11, mingw, Interix 3.5, BeOS.
+
+@item
+This function is broken on some platforms:
+Cygwin 1.5.24.