$(TARGET_SO) $(STATIC_LIB): $(FAILURES:.cpp=.failed)

.SUFFIXES: .failed

.cpp.failed:
	$(Q)$(RUBY) -rfileutils \
	  -e "t = ARGV.shift" \
	  -e "err = IO.popen(ARGV, err:[:child, :out], &:read)" \
	  -e "abort err unless /rb_define_method/ =~ err.b" \
	  -e "File.write(t, err)" $@ $(MAKE) $(*F).o

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