[Interest] Build Qt Source (mac): 'make' immediately hits an error ?

[David M. Cotter]

got all the way through "build from git" instructions, to the point where i execute "make", but immediately got this error:

> luna:clang_64 davec$ make
> Scanning dependencies of target Bootstrap
> [  0%] Building CXX object qtbase/src/tools/bootstrap/CMakeFiles/Bootstrap.dir/__/__/corelib/global/qendian.cpp.o
> In file included from /Volumes/Developer/depot/Qt5_Source/Src/qtbase/src/corelib/global/qendian.cpp:41:
> In file included from /Volumes/Developer/depot/Qt5_Source/Src/qtbase/src/corelib/global/qendian.h:44:
> In file included from /Volumes/Developer/depot/Qt5_Source/clang_64/qtbase/include/QtCore/qfloat16.h:1:
> In file included from /Volumes/Developer/depot/Qt5_Source/clang_64/qtbase/include/QtCore/../../../../Src/qtbase/src/corelib/global/qfloat16.h:44:
> In file included from /Volumes/Developer/depot/Qt5_Source/clang_64/qtbase/include/QtCore/qglobal.h:1:
> In file included from /Volumes/Developer/depot/Qt5_Source/clang_64/qtbase/include/QtCore/../../../../Src/qtbase/src/corelib/global/qglobal.h:1417:
> In file included from /Volumes/Developer/depot/Qt5_Source/clang_64/qtbase/include/QtCore/qtypeinfo.h:1:
> /Volumes/Developer/depot/Qt5_Source/clang_64/qtbase/include/QtCore/../../../../Src/qtbase/src/corelib/global/qtypeinfo.h:43:10: fatal error: 'variant' file not
>       found
> #include <variant>
>          ^~~~~~~~~
> 1 error generated.
> make[2]: *** [qtbase/src/tools/bootstrap/CMakeFiles/Bootstrap.dir/__/__/corelib/global/qendian.cpp.o] Error 1
> make[1]: *** [qtbase/src/tools/bootstrap/CMakeFiles/Bootstrap.dir/all] Error 2
> make: *** [all] Error 2
anyone have any ideas?
anyone want to make a few bucks helping me?
-dave
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