diff --git a/ChangeLog b/ChangeLog
index 2af25c3ed0..149edad772 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep 13 13:28:04 2002  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* lib/mkmf.rb ($INSTALLFILES): avoid warning when $VERBOSE mode.
+
 Thu Sep 12 23:20:10 2002  KONISHI Hiromasa <konishih@fd6.so-net.ne.jp>
 
 	* bcc32/setup.mak    : Control of a message.
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 646f85b412..d7f5b5e6f1 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -95,6 +95,8 @@ $LINK = "#{CONFIG['CC']} #{OUTFLAG}conftest %s -I#{$hdrdir} %s #{CFLAGS} %s #{CO
 $CC = "#{CONFIG['CC']} -c #{CONFIG['CPPFLAGS']} %s -I#{$hdrdir} %s #{CFLAGS} %s %s conftest.c"
 $CPP = "#{CONFIG['CPP']} #{CONFIG['CPPFLAGS']} %s -I#{$hdrdir} %s #{CFLAGS} %s %s %s conftest.c"
 
+$INSTALLFILES = nil unless defined? $INSTALLFILES
+
 def rm_f(*files)
   targets = []
   for file in files