--- Makefile.in.orig	2019-05-20 14:04:00 UTC
+++ Makefile.in
@@ -126,10 +126,6 @@ install: ccache$(EXEEXT) @disable_man@ccache.1
 clean:
 	rm -rf $(files_to_clean)
 
-src/snprintf.o: CFLAGS += @no_implicit_fallthrough_warning@
-$(zlib_objs): CPPFLAGS += -include config.h
-$(zlib_objs): CFLAGS += @no_implicit_fallthrough_warning@
-
 src/zlib/libz.a: $(zlib_objs)
 	$(if $(quiet),@echo "  AR       $@")
 	$(Q)$(AR) cr $@ $(zlib_objs)