diff -Nuar acpica-unix-20110922.orig/compiler/Makefile acpica-unix-20110922/compiler/Makefile
--- acpica-unix-20110922.orig/compiler/Makefile	2011-09-22 15:59:34.000000000 +0000
+++ acpica-unix-20110922/compiler/Makefile	2011-11-07 03:36:49.103281798 +0000
@@ -258,10 +258,10 @@
 #
 # Bison/Flex configuration
 #
-YACC=    bison
+YACC=    LC_ALL=C bison
 YFLAGS+= -v -d -y
 
-LEX=     flex
+LEX=     LC_ALL=C flex
 LFLAGS+= -i -s
 
 #