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1CXX_SOURCES := main.cpp2USE_LIBDL := 13 4all: hidden_lib a.out5 6include Makefile.rules7 8hidden_lib:9 "$(MAKE)" VPATH=$(SRCDIR)/hidden -C hidden -f $(MAKEFILE_RULES) \10 DYLIB_ONLY=YES DYLIB_CXX_SOURCES=d.cpp DYLIB_NAME=loadunload11 12