--- libev/configure.ac	2007/12/14 21:07:13	1.1
+++ libev/configure.ac	2011/06/24 12:55:08	1.32
@@ -1,17 +1,18 @@
-AC_INIT(ev_epoll.c)
+AC_INIT
+AC_CONFIG_SRCDIR([ev_epoll.c])
 
-AM_INIT_AUTOMAKE(libev,1.85)
-AM_CONFIG_HEADER(config.h)
+AM_INIT_AUTOMAKE(libev,4.09) dnl also update ev.h!
+AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE
 
-AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_LIBTOOL
 
 if test "x$GCC" = xyes ; then
-  CFLAGS="$CFLAGS -O3"
+  CFLAGS="-O3 $CFLAGS"
 fi
 
 m4_include([libev.m4])
 
-AC_OUTPUT(Makefile)
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT