Error when compiling with macports clang on OS X

[gudlaugu]

When I try to compile with clang++-mp-13 (libc++) from macports on OS X I get the following error

/opt/local/libexec/llvm-13/bin/../include/c++/v1/istream:321:26: error: implicit instantiation of undefined template 'std::ctype'
if (!__ct.is(__ct.space, *__i))

Does anyone know of a solution to this?

[matajoh]

Did you find a solution to this or is it still an ongoing issue?