diff --git a/ChangeLog b/ChangeLog
index e33202e2cb..89a0b43cdd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Apr 22 15:25:04 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (struct timespec): needs time.h according to POSIX.
+
 Tue Apr 22 13:19:48 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* thread.c (rb_thread_stop_timer_thread): should clear
diff --git a/configure.in b/configure.in
index cc83ae674a..4ab2446e73 100644
--- a/configure.in
+++ b/configure.in
@@ -592,7 +592,7 @@ AC_CHECK_HEADERS(stdlib.h string.h unistd.h limits.h sys/file.h sys/ioctl.h sys/
 		 fcntl.h sys/fcntl.h sys/select.h sys/time.h sys/times.h sys/param.h\
 		 syscall.h pwd.h grp.h a.out.h utime.h memory.h direct.h sys/resource.h \
 		 sys/mkdev.h sys/utime.h xti.h netinet/in_systm.h float.h ieeefp.h pthread.h \
-		 ucontext.h intrinsics.h langinfo.h locale.h sys/sendfile.h)
+		 ucontext.h intrinsics.h langinfo.h locale.h sys/sendfile.h time.h)
 
 dnl Check additional types.
 AC_CHECK_SIZEOF(rlim_t, 0, [
@@ -627,7 +627,9 @@ AC_CHECK_MEMBERS([struct stat.st_ctim])
 AC_CHECK_MEMBERS([struct stat.st_ctimespec])
 AC_CHECK_MEMBERS([struct stat.st_ctimensec])
 
-AC_CHECK_TYPES(struct timespec)
+AC_CHECK_TYPES([struct timespec], [], [], [@%:@ifdef HAVE_TIME_H
+@%:@include <time.h>
+@%:@endif])
 
 AC_CHECK_TYPE(fd_mask, [AC_DEFINE(HAVE_RB_FD_INIT, 1)])