--- acpica-unix-20140214/generate/unix/Makefile.config
+++ acpica-unix-20140214/generate/unix/Makefile.config
@@ -211,9 +211,9 @@
 #YACC=      byacc
 #YFLAGS +=
 #
-YACC=       bison
+YACC=       LC_ALL=C bison
 YFLAGS +=   -y
 
-LEX=        flex
+LEX=        LC_ALL=C flex
 LFLAGS +=   -i -s