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Fix build flags for Clang/Yacc

    This allows us to build with -Werror again. Thanks to Ryan
    Gonzalez.

--- a/mk/c.mk

+++ b/mk/c.mk

@@ -7,7 +7,7 @@

 _LIBPATHS=$(addprefix -l, $(patsubst lib%.a,%,$(notdir $(DEPS))))

 # yeah, I should probably remove -Werror, but it's nice for developing alone.

-CFLAGS += -Wall -Werror -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -g

+CFLAGS += -Wall -Werror -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wno-sign-compare -Wno-array-bounds -g

 CFLAGS += -MMD -MP -MF ${_DEPSDIR}/$(subst /,-,$*).d

 LIB ?= $(INSTLIB)

@@ -114,7 +114,7 @@

 %.o: %.c $(GENHDR) .deps

 	$(CC) -c $(CFLAGS) $(_LIBINCPATHS) $<

-.deps: 

+.deps:

 	mkdir -p $(_DEPSDIR)

 config.mk: configure

--- a/mk/lexyacc.mk

+++ b/mk/lexyacc.mk

@@ -1,7 +1,9 @@

 .SUFFIXES:

 %.h %.c: %.y

+	rm -f $*.h y.tab.h

 	yacc -d -o$*.c $<

+	[ -f y.tab.h ] && mv y.tab.h $*.h

 %.c: %.l

 	flex -o$*.c $<