Require bison to compile Wine.
diff --git a/Make.rules.in b/Make.rules.in
index ad28bc2..d66514f 100644
--- a/Make.rules.in
+++ b/Make.rules.in
@@ -25,7 +25,8 @@
CFLAGS = @CFLAGS@
CPPFLAGS = @CPPFLAGS@
LIBS = @LIBS@
-YACC = @YACC@
+BISON = @BISON@
+YACC = $(BISON) -y
LEX = @LEX@
LEXLIB = @LEXLIB@
EXEEXT = @EXEEXT@
@@ -103,7 +104,7 @@
api_manext = 3w
conf_manext = 5
CLEAN_FILES = *.o *.a *.so *.ln *.$(LIBEXT) \\\#*\\\# *~ *% .\\\#* *.bak *.orig *.rej \
- *.flc *.spec.c *.spec.def *.dbg.c y.tab.c y.tab.h @LEX_OUTPUT_ROOT@.c core
+ *.flc *.spec.c *.spec.def *.dbg.c *.tab.c *.tab.h @LEX_OUTPUT_ROOT@.c core
OBJS = $(C_SRCS:.c=.o) $(EXTRA_OBJS)