--- configure.in.orig	Fri Feb  6 17:04:39 2004
+++ configure.in	Wed Jan 19 01:44:24 2005
@@ -49,6 +49,43 @@
 fi
 ])
 
+dnl @synopsis AC_C99_FUNC_LRINTF
+dnl
+dnl Check whether C99's lrintf function is available.
+dnl @version 1.3        Feb 12 2002
+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,
+[
+lrintf_save_CFLAGS=$CFLAGS
+CFLAGS="-O -lm"
+AC_TRY_LINK([
+#define         _ISOC9X_SOURCE  1
+#define         _ISOC99_SOURCE  1
+#define         __USE_ISOC99    1
+#define         __USE_ISOC9X    1
+
+#include <math.h>
+], if (!lrintf(3.14159)) lrintf(2.7183);, ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)
+
+CFLAGS=$lrintf_save_CFLAGS
+
+])
+
+if test "$ac_cv_c99_lrintf" = yes; then
+  AC_DEFINE(HAVE_LRINTF, 1,
+            [Define if you have C99's lrintf function.])
+fi
+])# AC_C99_FUNC_LRINTF
+AC_C99_FUNC_LRINTF