+@node login_tty
+@subsection @code{login_tty}
+@findex login_tty
+
+Gnulib module: ---
+
+Portability problems fixed by Gnulib:
+@itemize
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
+@item
+This function is missing on some platforms:
+AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, mingw.
+@item
+This function requires linking with @code{-lutil} on some platforms:
+glibc 2.3.6, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8.
+It is available without link options on other platforms:
+MacOS X 10.3, OSF/1 5.1, Cygwin, Interix 3.5.
+@item
+This function is declared in @code{<utmp.h>} on glibc, Cygwin,
+in @code{<util.h>} on MacOS X 10.3, NetBSD 3.0, OpenBSD 3.8,
+in @code{<libutil.h>} on FreeBSD 6.0, Haiku, and not declared at all
+on OSF/1 5.1, Interix 3.5.
+@end itemize