@node login_tty
@subsection @code{login_tty}
@findex login_tty

Gnulib module: login_tty

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 11.0.
@item
This function requires linking with @code{-lutil} on some platforms:
glibc 2.3.6, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8.
It is available without link options on other platforms:
Mac OS X 10.5, OSF/1 5.1, Cygwin, Interix 3.5.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
mingw, MSVC 14.
@item
This function is declared in @code{<utmp.h>} on glibc, Cygwin,
in @code{<util.h>} on Mac OS X 10.5, NetBSD 5.0, 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.  Also note that @code{<sys/types.h>} is
a prerequisite of @code{<utmp.h>} on FreeBSD 8.0, OpenBSD 4.6 and
of @code{<libutil.h>} on FreeBSD 8.0.
@end itemize