I just downloaded 9.4.2 and trying to build with:
c++ --version
Apple clang version 17.0.0 (clang-1700.0.13.3)
Target: arm64-apple-darwin24.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
I get this error:
/Users/dpn/proj/ct-scan/mb/mb/VTK-9.4.2/ThirdParty/nlohmannjson/vtknlohmannjson/include/vtknlohmann/detail/input/binary_reader.hpp:68:41: error: implicit instantiation of undefined template ‘std::char_traits’
68 | using char_int_type = typename std::char_traits<char_type>::int_type;
It fails if I disable this package.