diff --git a/ChangeLog b/ChangeLog
index 02f83387b1..e07ac5d018 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Mar 13 09:25:10 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (clear-installed-list): separated from install-prereq.
+
 Tue Mar 13 07:23:20 2007  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* lib/monitor.rb (mon_try_enter): call @mon_muetx.try_lock.
diff --git a/common.mk b/common.mk
index 833f8f980e..536d996378 100644
--- a/common.mk
+++ b/common.mk
@@ -280,7 +280,11 @@ dont-install-doc::
 post-no-install-doc::
 	@$(NULLCMD)
 
-install-prereq:
+CLEAR_INSTALLED_LIST = clear-installed-list
+
+install-prereq: $(CLEAR_INSTALLED_LIST)
+
+clear-installed-list:
 	@exit > $(INSTALLED_LIST)
 
 clean: clean-ext clean-local