diff --git a/ChangeLog b/ChangeLog
index 2196f405bf..81a6757526 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Wed Dec 29 20:31:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Wed Dec 29 20:37:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/extmk.rb: strip current directory prefix.
 
 	* enc/depend (clean): remove name2ctype.h when out-of-place build.
 
diff --git a/ext/extmk.rb b/ext/extmk.rb
index 44c0b94aa8..f439be1248 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -415,6 +415,7 @@ cond = proc {|ext, *|
   withes.call(cond1) or !withouts.call(cond1)
 }
 ($extension || %w[*]).each do |e|
+  e = e.sub(/\A(?:\.\/)+/, '')
   exts |= Dir.glob("#{ext_prefix}/#{e}/**/extconf.rb").collect {|d|
     d = File.dirname(d)
     d.slice!(0, ext_prefix.length + 1)