Qt 6 incompatible with Clang?

[whatabout]

Compiling with Clang 14, which is a C++20 compiler, I am getting strange errors, below.
It there a flag I need to set to change Clang's compatibility?

In file included from /usr/include/x86_64-linux-gnu/qt6/QtWidgets/QMainWindow:1:
In file included from /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qmainwindow.h:7:
In file included from /usr/include/x86_64-linux-gnu/qt6/QtWidgets/qtwidgetsglobal.h:7:
In file included from /usr/include/x86_64-linux-gnu/qt6/QtGui/qtguiglobal.h:7:
/usr/include/x86_64-linux-gnu/qt6/QtCore/qglobal.h:106:6: error: "Qt requires a C++17 compiler"
#    error "Qt requires a C++17 compiler"
     ^
/usr/include/x86_64-linux-gnu/qt6/QtCore/qglobal.h:491:11: warning: inline variables are a C++17 extension [-Wc++17-extensions]
constexpr inline Deprecated_t Deprecated = {};
          ^
/usr/include/x86_64-linux-gnu/qt6/QtCore/qglobal.h:1009:43: error: no template named 'is_arithmetic_v' in namespace 'std'; did you mean 'is_arithmetic'?
         typename = std::enable_if_t<std::is_arithmetic_v<T> && std::is_arithmetic_v<U> &&
                                     ~~~~~^~~~~~~~~~~~~~~
                                          is_arithmetic
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/type_traits:585:12: note: 'is_arithmetic' declared here
    struct is_arithmetic

[whatabout]

@Christian-Ehrlicher
Yes, it turns out the fix is simple:

clang -std=c++17

[Christian Ehrlicher]

Please show your pro-file / CMakeLists.txt and make sure you've enabled c++17 support.

[whatabout]

@Christian-Ehrlicher I'm not using either a .pro file or a cmake file. I'm just using a regular Makefile and I'm not specifying any particular C++ compatibility. In my situation I can't use either qmake or cmake. So for instance, I am running moc myself.

[Christian Ehrlicher]

@whatabout Then make sure to enable c++17 as I already wrote.

[whatabout]

@Christian-Ehrlicher
Yes, it turns out the fix is simple:

clang -std=c++17