Cannot build and run Canvas3d examples in an out of sources build

I build Qt out of sources and with examples, using this approach so that at the end, I have Qt binaries, libs, examples, ... in %DESTDIR%, so something like :

cd %BUILDDIR%
%SRCDIR%\configure [...] -prefix %DESTDIR%
nmake
nmake install

Then I couldn't build and run Canvas3D examples because :

• nmake complains that ..\..\..\...\examples.pri is missing
• the following folders are missing in destination folders :
  • examples\canvas3d\canvas3d\3rdparty
  • examples\canvas3d\canvas3d\threejs\controls

As a workaround, I copied manually the missing folders and files. Also note that the .pro files from qtcanvas3d examples are looking for examples.pri in root examples dir and not in canvas3d subdir.