message: gtest has unused variables that g++ complains about, at least on windows.
diff: @@ -47,7 +47,7 @@ $(LIBGTEST): $(LIBGTEST)(test/gtest.o)
  test/gtest.o: $(GTEST)/src/gtest-all.cc
  @mkdir -p test
  - $(COMPILE.cc) -O$O $(GTEST_CXXFLAGS) $< $(OUTPUT_OPTION)
  + $(COMPILE.cc) -O$O $(GTEST_CXXFLAGS) $< $(OUTPUT_OPTION) -Wno-unused-variable
  test/%.o : src/test/%.cpp
  @mkdir -p $(dir $@)
  