--- a/doc/Makefile	Wed Jul 03 21:49:43 2013 +0900
+++ b/doc/Makefile	Wed Jul 03 21:50:20 2013 +0900
@@ -9,8 +9,7 @@
 PYTHON=python
 RSTARGS=
 
-export LANGUAGE=C
-export LC_ALL=C
+export HGENCODING=UTF-8
 
 all: man html