diff --git a/ChangeLog b/ChangeLog
index 1b7302b259..3ef25c1773 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Fri Dec 21 01:17:57 2001  Nobuyoshi Nakada  <nobu.nakada@nifty.ne.jp>
+
+	* lib/mkmf.rb (with_destdir): new.
+
+	* lib/mkmf.rb: prefix target directories with $(DESTDIR) all.
+
+	* lib/mkmf.rb: no need to mkdir $(libdir)
+
 Thu Dec 20 14:08:20 2001  Minero Aoki  <aamine@loveruby.net>
 
 	* lib/net/protocol.rb: rename Net::Socket to Net::BufferedSocket
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 47d468d2f1..fb6253b3f5 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -364,6 +364,10 @@ def dir_config(target, idefault=nil, ldefault=nil)
   [idir, ldir]
 end
 
+def with_destdir(dir)
+  /^\$[\(\{]/ =~ dir ? dir : "$(DESTDIR)"+dir
+end
+
 def create_makefile(target, srcdir = File.dirname($0))
   save_libs = $libs.dup
   save_libpath = $LIBPATH.dup
@@ -455,14 +459,14 @@ else
   ""
 end
 }
-prefix = $(DESTDIR)#{CONFIG["prefix"].sub(drive, '')}
-exec_prefix = #{CONFIG["exec_prefix"].sub(drive, '')}
-libdir = #{$libdir.sub(drive, '')}
-rubylibdir = #{$rubylibdir.sub(drive, '')}
-archdir = #{$archdir.sub(drive, '')}
-sitedir = #{$sitedir.sub(drive, '')}
-sitelibdir = #{$sitelibdir.sub(drive, '')}
-sitearchdir = #{$sitearchdir.sub(drive, '')}
+prefix = #{with_destdir CONFIG["prefix"].sub(drive, '')}
+exec_prefix = #{with_destdir CONFIG["exec_prefix"].sub(drive, '')}
+libdir = #{with_destdir $libdir.sub(drive, '')}
+rubylibdir = #{with_destdir $rubylibdir.sub(drive, '')}
+archdir = #{with_destdir $archdir.sub(drive, '')}
+sitedir = #{with_destdir $sitedir.sub(drive, '')}
+sitelibdir = #{with_destdir $sitelibdir.sub(drive, '')}
+sitearchdir = #{with_destdir $sitearchdir.sub(drive, '')}
 target_prefix = #{target_prefix}
 
 #### End of system configuration section. ####
@@ -503,7 +507,7 @@ EOMF
 
   mfile.printf <<EOMF
 $(sitearchdir)$(target_prefix)/$(DLLIB): $(DLLIB)
-	@$(RUBY) -r ftools -e 'File::makedirs(*ARGV)' $(libdir) $(sitearchdir)$(target_prefix)
+	@$(RUBY) -r ftools -e 'File::makedirs(*ARGV)' $(sitearchdir)$(target_prefix)
 	@$(RUBY) -r ftools -e 'File::install(ARGV[0], ARGV[1], 0555, true)' $(DLLIB) $(sitearchdir)$(target_prefix)/$(DLLIB)
 EOMF
   install_rb(mfile, "$(sitelibdir)$(target_prefix)", srcdir)
diff --git a/version.h b/version.h
index 2875f399c5..c525a9e91c 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #define RUBY_VERSION "1.7.2"
-#define RUBY_RELEASE_DATE "2001-12-19"
+#define RUBY_RELEASE_DATE "2001-12-20"
 #define RUBY_VERSION_CODE 172
-#define RUBY_RELEASE_CODE 20011219
+#define RUBY_RELEASE_CODE 20011220