diff --git a/ChangeLog b/ChangeLog
index 9e407766b6..016c307ef5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun May  5 13:28:54 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* template/ruby.pc.in (Cflags): use rubyarchhdrdir for multiarch.
+	  [Bug #7874]
+
 Sat May  4 07:20:00 2013  Zachary Scott  <zachary@zacharyscott.net>
 
 	* doc/security.rdoc: Add note about reporting security vulns
diff --git a/template/ruby.pc.in b/template/ruby.pc.in
index 4137d98cfc..8a2c066e9c 100644
--- a/template/ruby.pc.in
+++ b/template/ruby.pc.in
@@ -34,6 +34,9 @@ sitearchdir=@sitearchdir@
 rubyhdrdir=@rubyhdrdir@
 vendorhdrdir=@vendorhdrdir@
 sitehdrdir=@sitehdrdir@
+rubyarchhdrdir=@rubyarchhdrdir@
+vendorarchhdrdir=@vendorarchhdrdir@
+sitearchhdrdir=@sitearchhdrdir@
 LIBPATH=@LIBPATH@
 LIBRUBY_A=@LIBRUBY_A@
 LIBRUBY_SO=@LIBRUBY_SO@
@@ -48,6 +51,6 @@ Name: Ruby
 Description: Object Oriented Script Language
 Version: ${ruby_version}
 URL: http://www.ruby-lang.org
-Cflags: -I${rubyhdrdir}/${arch} -I${rubyhdrdir}
+Cflags: -I${rubyarchhdrdir} -I${rubyhdrdir}
 Libs: ${DLDFLAGS} ${LIBRUBYARG_SHARED} ${LIBS}
 Requires: