diff --git a/ChangeLog b/ChangeLog
index 46be40b48a..a3b4ccdb8f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,10 +1,12 @@
-Sat Feb 19 10:43:46 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sat Feb 19 13:31:28 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/extmk.rb (extract_makefile): remove no longer existing installed
 	  files.
 
 	* lib/mkmf.rb (install_dirs): return installation directory list.
 
+	* lib/mkmf.rb (create_makefile): reverted wrongly removed lines.
+
 Sat Feb 19 01:28:56 2005  Hirokazu Yamamoto  <ocean@m2.ccsnet.ne.jp>
 
 	* ext/bigdecimal/lib/bigdecimal/newton.rb: resolve LoadError.
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 23d94c7617..c4c16c44ea 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -922,6 +922,9 @@ def create_makefile(target, srcprefix = nil)
 
   if target.include?('/')
     target_prefix, target = File.split(target)
+    target_prefix[0,0] = '/'
+  else
+    target_prefix = ""
   end
 
   srcprefix ||= '$(srcdir)'