AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h locale.h termios.h linux/termios.h sys/ioctl.h)
AC_CHECK_HEADER(stdarg.h,AC_DEFINE(HAVE_STDARG_H),AC_MSG_ERROR([*** stdarg.h is missing on your system ***]))
AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h locale.h termios.h linux/termios.h sys/ioctl.h)
AC_CHECK_HEADER(stdarg.h,AC_DEFINE(HAVE_STDARG_H),AC_MSG_ERROR([*** stdarg.h is missing on your system ***]))