diff --git a/ChangeLog b/ChangeLog
index 596ad30050..dc6885b3df 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Feb 21 14:41:10 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* template/ruby.pc.in: added rubylibprefix, {rubylib,vendor,site}dir
+	  and {ruby,vendor,site}archdir.  [ruby-core:42766][Feature #6052]
+
 Tue Feb 21 09:13:25 2012  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* proc.c (method_hash, proc_hash): Fix {Unbound}Method#hash
diff --git a/template/ruby.pc.in b/template/ruby.pc.in
index 2189667c5e..2d6716c73c 100644
--- a/template/ruby.pc.in
+++ b/template/ruby.pc.in
@@ -24,6 +24,13 @@ LIBRUBYARG=@LIBRUBYARG@
 LIBS=@LIBS@
 DLDFLAGS=@DLDFLAGS@
 ruby=${bindir}/${RUBY_INSTALL_NAME}@EXEEXT@
+rubylibprefix=@rubylibprefix@
+rubylibdir=${rubylibprefix}/${ruby_version}
+vendordir=${rubylibprefix}/vendor_ruby
+sitedir=${rubylibprefix}/site_ruby
+rubyarchdir=${rubylibdir}/${arch}
+vendorarchdir=${vendordir}/${sitearch}
+sitearchdir=${sitedir}/${sitearch}
 rubyhdrdir=@rubyhdrdir@
 vendorhdrdir=@vendorhdrdir@
 sitehdrdir=@sitehdrdir@