--- libaitsched/configure.in	2014/01/27 14:56:27	1.31.2.3
+++ libaitsched/configure.in	2014/05/19 22:28:50	1.34.2.4
@@ -1,8 +1,8 @@
 #
 # $Author: misho $
-# $Id: configure.in,v 1.31.2.3 2014/01/27 14:56:27 misho Exp $
+# $Id: configure.in,v 1.34.2.4 2014/05/19 22:28:50 misho Exp $
 #
-AC_INIT(libaitsched, 4.7, misho@elwix.org)
+AC_INIT(libaitsched, 5.2, misho@elwix.org)
 AC_CONFIG_SRCDIR([src/aitsched.c])
 AC_CONFIG_HEADERS([inc/config.h])
 
@@ -17,7 +17,7 @@ AC_PROG_RANLIB
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
 
-AC_CHECK_TOOL(MKDEP, mkdep, no)
+AC_CHECK_TOOL(MKDEP, mkdep, ../mkdep)
 AC_SUBST(MKDEP)
 
 CFLAGS="-Wall -O2 -fPIC ${CFLAGS}"
@@ -37,7 +37,7 @@ AC_TYPE_SIZE_T
 
 # Checks for library functions.
 AC_FUNC_MALLOC
-AC_CHECK_FUNCS([clock_gettime memset strerror timer_create timer_settime])
+AC_CHECK_FUNCS([clock_gettime memset strerror timer_create timer_settime timer_delete])
 
 DEBUG=no
 AC_MSG_CHECKING(Debug Build)
@@ -75,12 +75,12 @@ AC_ARG_ENABLE(kqueue,
 	[  --disable-kqueue        Disable kqueue support ],
 	[ KQSUP=$enableval
 		case "$enableval" in
-			no)
-				AC_DEFINE(KQ_DISABLE,, [Disable kqueue support])
+			yes)
+				AC_DEFINE(KQ_ENABLE,, [Enable kqueue support])
 				;;
 			*)
 				;;
-	 	esac ],)
+	 	esac ], [ AC_DEFINE(KQ_ENABLE,, [Enable kqueue support]) ])
 AC_MSG_RESULT($KQSUP)
 
 KQ_EVENTS=24
@@ -90,6 +90,20 @@ AC_ARG_WITH(kq_events, 
 	[ KQ_EVENTS=$withval ], KQ_EVENTS=32)
 AC_DEFINE_UNQUOTED(KQ_EVENTS, $KQ_EVENTS, [ How many kqueue events can scheduling at one time ])
 AC_MSG_RESULT($KQ_EVENTS)
+
+EPSUP=no
+AC_MSG_CHECKING(epoll support)
+AC_ARG_ENABLE(epoll,
+	[  --enable-epoll          Enable epoll support (only under Linux) ],
+	[ EPSUP=$enableval
+		case "$enableval" in
+			yes)
+				AC_DEFINE(EP_ENABLE,, [Enable epoll support])
+				;;
+			*)
+				;;
+	 	esac ],)
+AC_MSG_RESULT($EPSUP)
 
 AC_CONFIG_FILES([Makefile
                  inc/Makefile