@item
This function does not support the error values that are specified by POSIX
but not defined by the system, on some platforms:
-OpenBSD 4.0, OSF/1 5.1, NonStop Kernel, Cygwin 1.5.x, mingw.
+OpenBSD 4.0, OSF/1 5.1, NonStop Kernel, Cygwin 1.5.x, mingw, MSVC 9.
@item
This function reports failure for @code{strerror(0)} (by setting
@code{errno} or using a string similar to out-of-range values),