dnl @synopsis AC_C99_FUNC_LRINTF
dnl
dnl Check whether C99's lrintf function is available.
dnl @version 1.1
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any 
dnl purpose is hereby granted without fee, provided that the above copyright 
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is 
dnl provided "as is" without express or implied warranty.
dnl
AC_DEFUN([AC_C99_FUNC_LRINTF],
[AC_CACHE_CHECK(for lrintf,
  ac_cv_c99_lrintf,
[AC_TRY_COMPILE([
#define		_ISOC9X_SOURCE	1
#define 	_ISOC99_SOURCE	1
#define		__USE_ISOC99	1
#define 	__USE_ISOC9X	1
#include	<math.h>],
[	int value = lrintf (0.432) ; ], ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)])
if test "x$ac_cv_c99_lrintf" = "xyes"; then
  AC_DEFINE(HAVE_LRINTF, 1,
            [Define if you have C99's lrintf function.])
fi
])# AC_C99_LRINTF