New module 'login_tty'.

[gnulib.git] / m4 / pty.m4

diff --git a/m4/pty.m4 b/m4/pty.m4
index 6d2393b..f795792 100644 (file)
--- a/m4/pty.m4
+++ b/m4/pty.m4
@@ -1,4 +1,4 @@
-# pty.m4 serial 3
+# pty.m4 serial 4
 dnl Copyright (C) 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -120,3 +120,13 @@ AC_DEFUN([gl_OPENPTY],
     AC_CHECK_FUNCS([_getpty posix_openpt])
   fi
 ])
+
+AC_DEFUN([gl_FUNC_LOGIN_TTY],
+[
+  AC_REQUIRE([gl_PTY_LIB])
+
+  AC_CHECK_FUNCS_ONCE([login_tty])
+  if test $ac_cv_func_login_tty = no; then
+    AC_LIBOBJ([login_tty])
+  fi
+])