--- libev/libev.m4	2007/11/16 01:43:52	1.2
+++ libev/libev.m4	2008/11/20 00:35:10	1.11
@@ -2,13 +2,36 @@
 dnl http://software.schmorp.de/pkg/libev
 
 dnl libev support 
-AC_CHECK_HEADERS(sys/epoll.h sys/event.h sys/queue.h port.h) 
+AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h sys/queue.h port.h poll.h sys/select.h sys/eventfd.h) 
  
-AC_CHECK_FUNCS(epoll_ctl kqueue port_create)
+AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select eventfd)
  
 AC_CHECK_FUNC(clock_gettime, [], [ 
-  AC_CHECK_LIB(rt, clock_gettime) 
-  AC_CHECK_FUNCS(clock_gettime)
+   dnl on linux, try syscall wrapper first
+   if test $(uname) = Linux; then
+      AC_MSG_CHECKING(for clock_gettime syscall)
+      AC_LINK_IFELSE([AC_LANG_PROGRAM(
+                      [#include <syscall.h>
+                       #include <time.h>],
+                      [struct timespec ts; int status = syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts)])],
+                     [ac_have_clock_syscall=1
+                      AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, "use syscall interface for clock_gettime")
+                      AC_MSG_RESULT(yes)],
+                     [AC_MSG_RESULT(no)])
+   fi
+   if test -z "$LIBEV_M4_AVOID_LIBRT" && test -z "$ac_have_clock_syscall"; then
+      AC_CHECK_LIB(rt, clock_gettime) 
+      unset ac_cv_func_clock_gettime
+      AC_CHECK_FUNCS(clock_gettime)
+   fi
+])
+
+AC_CHECK_FUNC(nanosleep, [], [ 
+   if test -z "$LIBEV_M4_AVOID_LIBRT"; then
+      AC_CHECK_LIB(rt, nanosleep) 
+      unset ac_cv_func_nanosleep
+      AC_CHECK_FUNCS(nanosleep)
+   fi
 ])
 
 AC_CHECK_LIB(m, ceil)