--- doc/Makefile.in.orig	2014-03-17 12:14:42.000000000 +0900
+++ doc/Makefile.in	2014-05-27 05:09:56.000000000 +0900
@@ -33,7 +33,7 @@
     esac; \
     test $$am__dry = yes; \
   }
-pkgdatadir = $(datadir)/@PACKAGE@
+pkgdatadir = $(docdir)
 pkgincludedir = $(includedir)/@PACKAGE@
 pkglibdir = $(libdir)/@PACKAGE@
 pkglibexecdir = $(libexecdir)/@PACKAGE@