diff --git a/ChangeLog b/ChangeLog
index 22cda3aa1f..71aa4939f2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Sep 25 00:35:01 2000  WATANABE Hirofumi  <eban@os.rim.or.jp>
+
+	* defines.h: #undef HAVE_SETITIMER on cygwin.
+
 Sun Sep 24 03:01:53 2000  Minero Aoki  <aamine@dp.u-netsurf.ne.jp>
 
 	* lib/net/protocol.rb, http.rb: typo.
diff --git a/defines.h b/defines.h
index e4ae64839e..fefddee23b 100644
--- a/defines.h
+++ b/defines.h
@@ -73,7 +73,7 @@
 #undef HAVE_SETITIMER
 #endif
 
-#if defined(DJGPP) || defined(__BOW__)
+#if defined(DJGPP) || defined(__BOW__) || defined __CYGWIN__
 #undef HAVE_SETITIMER
 #endif
 
diff --git a/version.h b/version.h
index 6213901619..a6c1418256 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #define RUBY_VERSION "1.6.1"
-#define RUBY_RELEASE_DATE "2000-09-22"
+#define RUBY_RELEASE_DATE "2000-09-24"
 #define RUBY_VERSION_CODE 161
-#define RUBY_RELEASE_CODE 20000922
+#define RUBY_RELEASE_CODE 20000924