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libraries/AP_Math/tests/test_math.cpp.3.o: In function `MathTest_IsEqual_Test::TestBody()': test_math.cpp:(.text._ZN21MathTest_IsEqual_Test8TestBodyEv+0x1a0): undefined reference to `std::enable_if<std::is_floating_point<std::common_type<float, double>::type>::value, bool>::type is_equal<float, double>(float, double)' collect2: error: ld returned 1 exit status