-AC_CHECK_TYPE([struct termios2], [AC_DEFINE(HAVE_TERMIOS2, 1)], [], [[#include <linux/termios.h>]])
-AC_CHECK_TYPE([struct termiox], [AC_DEFINE(HAVE_TERMIOX, 1)], [], [[#include <linux/termios.h>]])
+AC_CHECK_TYPE([struct termios2],
+ [AC_DEFINE(HAVE_TERMIOS2, 1,
+ [struct termios2 is available.])],
+ [], [[#include <linux/termios.h>]])
+AC_CHECK_TYPE([struct termiox],
+ [AC_DEFINE(HAVE_TERMIOX, 1,
+ [struct termiox is available.])],
+ [], [[#include <linux/termios.h>]])