Building examples with qmake / cmake using Qt 6.0.0 snapshot fails

$ /Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/bin/qmake /Volumes/T3/Dev/qt/official_qt/Examples/Qt-6.0.0/quickcontrols2/gallery/

$ make

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -c -pipe -stdlib=libc++ -O2 -std=gnu++1z  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.14 -Wall -Wextra -fPIC -DGL_SILENCE_DEPRECATION -DQT_NO_DEBUG -DQT_QUICKCONTROLS2_LIB -DQT_QUICK_LIB -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../../../qt/official_qt/Examples/Qt-6.0.0/quickcontrols2/gallery -I. -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQuickControls2.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQuick.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtOpenGL.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtGui.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQmlModels.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQml.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtNetwork.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtCore.framework/Headers -I. -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/Applications/Xcode11.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/OpenGL.framework -I../../../qt/official_qt/6.0.0/clang_64/mkspecs/macx-clang -F/Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib -o gallery.o ../../../qt/official_qt/Examples/Qt-6.0.0/quickcontrols2/gallery/gallery.cpp
/Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/bin/rcc -name qmake_qmake_immediate qmake_qmake_immediate.qrc -o qrc_qmake_qmake_immediate.cpp
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -c -pipe -stdlib=libc++ -O2 -std=gnu++1z  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.14 -Wall -Wextra -fPIC -DGL_SILENCE_DEPRECATION -DQT_NO_DEBUG -DQT_QUICKCONTROLS2_LIB -DQT_QUICK_LIB -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../../../qt/official_qt/Examples/Qt-6.0.0/quickcontrols2/gallery -I. -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQuickControls2.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQuick.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtOpenGL.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtGui.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQmlModels.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtQml.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtNetwork.framework/Headers -I../../../qt/official_qt/6.0.0/clang_64/lib/QtCore.framework/Headers -I. -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/Applications/Xcode11.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/OpenGL.framework -I../../../qt/official_qt/6.0.0/clang_64/mkspecs/macx-clang -F/Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib -o qrc_qmake_qmake_immediate.o qrc_qmake_qmake_immediate.cpp
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -stdlib=libc++ -headerpad_max_install_names  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.14 -Wl,-rpath,@executable_path/../Frameworks -Wl,-rpath,/Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib -o gallery.app/Contents/MacOS/gallery gallery.o qrc_qmake_qmake_immediate.o   -F/Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib -framework QtQuickControls2 /Users/qt/work/install/lib/QtQuick.framework/Versions/6/QtQuick /Users/qt/work/install/lib/QtQmlModels.framework/Versions/6/QtQmlModels /Users/qt/work/install/lib/QtOpenGL.framework/Versions/6/QtOpenGL /Users/qt/work/install/lib/QtGui.framework/Versions/6/QtGui /Applications/Xcode11.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/OpenGL.framework/OpenGL.tbd /Users/qt/work/install/lib/QtQml.framework/Versions/6/QtQml /Users/qt/work/install/lib/QtNetwork.framework/Versions/6/QtNetwork /Users/qt/work/install/lib/QtCore.framework/Versions/6/QtCore -framework QtQuick /Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib/QtQmlModels.framework/Versions/6/QtQmlModels /Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib/QtQml.framework/Versions/6/QtQml -framework QtOpenGL /Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib/QtGui.framework/Versions/6/QtGui /Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64/lib/QtCore.framework/Versions/6/QtCore -framework QtGui -framework AppKit -framework ImageIO -framework Metal -framework QtQmlModels -framework QtQml -framework QtNetwork -framework QtCore -framework DiskArbitration -framework IOKit
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtQuick.framework/Versions/6/QtQuick'
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtQmlModels.framework/Versions/6/QtQmlModels'
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtOpenGL.framework/Versions/6/QtOpenGL'
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtGui.framework/Versions/6/QtGui'
clang: error: no such file or directory: '/Applications/Xcode11.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/OpenGL.framework/OpenGL.tbd'
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtQml.framework/Versions/6/QtQml'
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtNetwork.framework/Versions/6/QtNetwork'
clang: error: no such file or directory: '/Users/qt/work/install/lib/QtCore.framework/Versions/6/QtCore'
make: *** [gallery.app/Contents/MacOS/gallery] Error 1

-F/Volumes/T3/Dev/qt/qt60_built_fw/qtbase/lib -framework QtGui -framework AppKit -framework Metal -framework QtCore
-framework DiskArbitration -framework IOKit

$ cmake -DCMAKE_PREFIX_PATH=/Volumes/T3/Dev/qt/official_qt/6.0.0/clang_64 /Volumes/T3/Dev/qt/official_qt/Examples/Qt-6.0.0/quickcontrols2/gallery
# ....
-- Build files have been written to: /Volumes/T3/Dev/projects/qmake/qt6snapshot_examples

$ ninja
makeobj[0]: Entering directory `/Volumes/T3/Dev/projects/qmake/qt6snapshot_examples'
ninja: error: '/Applications/Xcode11.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/DiskArbitration.framework', needed by 'gallery_controls2.app/Contents/MacOS/gallery_controls2', missing and no known rule to make it
makeobj[0]: Leaving directory `/Volumes/T3/Dev/projects/qmake/qt6snapshot_examples'