@itemize
@item
This function is missing on some platforms:
-AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, mingw.
+AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10.
@item
One some systems (at least including Cygwin, Interix, OSF/1 4 and 5,
and Mac OS X) linking with @code{-lutil} is not required.
Portability problems not fixed by Gnulib:
@itemize
+@item
+This function is missing on some platforms:
+mingw.
+@item
+After a successful call to @code{openpty}, the application needs to close
+the master's file descriptor before closing the slave's file descriptor,
+otherwise the process may hang in a state where it cannot be killed, on
+some platforms: MacOS X 10.4.11.
@end itemize