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This function is missing on some platforms:
-MacOS X 10.3, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw, Interix 3.5, BeOS.
+MacOS X 10.5, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11, mingw, Interix 3.5, BeOS.
On those platforms, this module provides a stub that always sets
@code{errno} to @code{ENOTSUP} and returns @samp{-1}.
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