diff --git a/ChangeLog b/ChangeLog
index 85bd29e8e2..8448f9dae6 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 06:38:43 2007  Akinori MUSHA  <knu@iDaemons.org>
 
 	* NEWS: Reword and improve entries.
diff --git a/common.mk b/common.mk
index f751fecfb5..71df932537 100644
--- a/common.mk
+++ b/common.mk
@@ -257,7 +257,11 @@ 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