Undefined symbols for architecture x86_64:
  "std::string::c_str() const", referenced from:
      UnitTest::MemoryOutStream::GetText() const in libunittest++.a(MemoryOutStream.o)
  "std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::str() const", referenced from:
      UnitTest::MemoryOutStream::GetText() const in libunittest++.a(MemoryOutStream.o)
  "std::ostream::~std::ostream()", referenced from:
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "std::ostream::~std::ostream()", referenced from:
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "std::ostream::operator<<(int)", referenced from:
      UnitTest::TestRunner::RunTest(UnitTest::TestResults*, UnitTest::Test*, int) const in libunittest++.a(TestRunner.o)
  "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()", referenced from:
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(Test.o)
  "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from:
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(Test.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(Test.o)
      UnitTest::MemoryOutStream::GetText() const in libunittest++.a(MemoryOutStream.o)
  "std::string::operator=(std::string const&)", referenced from:
      UnitTest::MemoryOutStream::GetText() const in libunittest++.a(MemoryOutStream.o)
  "std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream(std::_Ios_Openmode)", referenced from:
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(Test.o)
  "std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()", referenced from:
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()", referenced from:
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()", referenced from:
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(Test.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(Test.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(Test.o)
  "std::basic_ios<char, std::char_traits<char> >::basic_ios()", referenced from:
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(Test.o)
  "std::basic_ios<char, std::char_traits<char> >::~basic_ios()", referenced from:
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(TestRunner.o)
      UnitTest::MemoryOutStream::MemoryOutStream() in libunittest++.a(Test.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(Test.o)
      UnitTest::MemoryOutStream::~MemoryOutStream() in libunittest++.a(Test.o)
  "std::basic_ostream<char, std::char_traits<char> >& std::operator<<<std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
      UnitTest::TestRunner::RunTest(UnitTest::TestResults*, UnitTest::Test*, int) const in libunittest++.a(TestRunner.o)
      void UnitTest::ExecuteTest<UnitTest::Test>(UnitTest::Test&, UnitTest::TestDetails const&) in libunittest++.a(Test.o)
  "typeinfo for std::ostream", referenced from:
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "typeinfo for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >", referenced from:
      typeinfo for UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      typeinfo for UnitTest::MemoryOutStream in libunittest++.a(Test.o)
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "non-virtual thunk to std::ostream::~std::ostream()", referenced from:
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "non-virtual thunk to std::ostream::~std::ostream()", referenced from:
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::ostream-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "non-virtual thunk to std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()", referenced from:
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
  "non-virtual thunk to std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_ostringstream()", referenced from:
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(TestRunner.o)
      construction vtable for std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >-in-UnitTest::MemoryOutStream in libunittest++.a(Test.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [fmtest] Error 1
make[1]: *** [CMakeFiles/fmtest.dir/all] Error 2
make: *** [all] Error 2