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# isatty.m4 serial 3
dnl Copyright (C) 2012-2017 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  dnl On native Windows, the system's isatty(), defined as an alias of _isatty()
  dnl in the "oldnames" library, returns true for the NUL device.
  case $host_os in
    mingw*) REPLACE_ISATTY=1 ;;

# Prerequisites of lib/isatty.c.