qmake6 generats bad Makefile after W11 build 6.6.2 from source

Just after creating what seems like a clean build for 6.6.2 (with SQL plugins) from source on Windows 11, copied a working program to a test area to begin learning and upgrading to Qt 6 from a very stable Qt5.15.2.  6.6.2 was build with MSVC whild 5.15.2 was build with MINGW tools.

Using the existing Qt5 PRO file, I first ran qmake which ran w/o error.  Then ran make which complained about the Makefile created by qmake.  make generated error message:

y:\rif\7>make
Makefile:126: *** missing separator.  Stop.

and the offending section in the Makefile is:

123: {buildw\moc\cpp}.cpp{buildw\obj}.obj::
124:    $(CXX) -c $(CXXFLAGS) $(INCPATH) -Fobuildw\obj\ @<<
125:    $<
126:<<