Header files are not being copied into the Qt* frameworks in custom build

./configure -prefix <install path> -release -commercial -confirm-license -nomake examples -c++std c++17 -platform macx-clang -skip qtconnectivity -skip qtlocation -skip qtquickcontrols -skip qtscript -skip qtsensors -skip qtwebsockets -skip qtwebchannel -skip qtwebengine -skip qtxmlpatterns -skip qtquickcontrols2 -skip qtwebview -skip qtwayland -skip qtdeclarative -skip qtvirtualkeyboard -force-debug-info -no-openssl -skip qtquicktimeline -skip qtquick3d -skip qtdoc -skip qtlottie -skip qtmqtt -skip qtopcua -skip qtquick3dphysics -skip qtscxml -skip qtquickeffectmaker

cmake --build . --parallel
cmake --install .
qtbase/lib/QtGui.framework/Headers/ directory only contains a Gui_fake_header.h file. This is the case for all frameworks (i.e., they all only contain a <framework name>_fake_header.h file).