0.7.4: Tests fail to compile: undefined symbol: std::__1::basic_ostream<char, std::__1: ...

[yurivict]

clang-12 fails to compile it:

FAILED: test/test_xiterator_base 
: && /usr/bin/c++ -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -fno-strict-aliasing -fno-omit-frame-pointer -O2 -pipe -fno-omit-frame-pointer -fstack-protector-strong -fno-strict-aliasing -fno-omit-frame-pointer -fstack-protector-strong test/CMakeFiles/test_xiterator_base.dir/main.cpp.o test/CMakeFiles/test_xiterator_base.dir/test_xiterator_base.cpp.o -o test/test_xiterator_base  -pthread && :
ld: error: undefined symbol: std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<char, std::__1::char_traits<char>, std::__1::allocator<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)
>>> referenced by test_xiterator_base.cpp
>>>               test/CMakeFiles/test_xiterator_base.dir/test_xiterator_base.cpp.o:(doctest::String doctest::detail::stringifyBinaryExpr<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, char [2]>(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char const*, char const (&) [2]))
c++: error: linker command failed with exit code 1 (use -v to see invocation)