AC_DEFUN([gl_HEADER_TIOCGWINSZ_NEEDS_SYS_IOCTL],
[AC_REQUIRE([gl_HEADER_TIOCGWINSZ_IN_TERMIOS_H])
AC_CACHE_CHECK([whether use of TIOCGWINSZ requires sys/ioctl.h],
AC_DEFUN([gl_HEADER_TIOCGWINSZ_NEEDS_SYS_IOCTL],
[AC_REQUIRE([gl_HEADER_TIOCGWINSZ_IN_TERMIOS_H])
AC_CACHE_CHECK([whether use of TIOCGWINSZ requires sys/ioctl.h],