--- Makefile.in.orig	2012-12-29 20:49:48.573619000 +0900
+++ Makefile.in	2013-01-29 11:19:56.000000000 +0900
@@ -401,7 +401,7 @@
 	CMakeLists.txt				\
 	config.h.cmake
 
-pkgconfigdir = $(libdir)/pkgconfig
+pkgconfigdir = $(prefix)/libdata/pkgconfig
 pkgconfig_DATA = groonga.pc
 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-recursive