Hey,
I built opencv 4.0.0 with

cmake -D CMAKE_BUILD_TYPE=RELEASE
-D BUILD_opencv_apps=ON
-D OPENCV_EXTRA_MODULES_PATH=<path_to...>/modules ..

However, in "build/app" there are no createsamples and traincascade. There are annotation, interractive-calibration, version and visualisation only.
These folders are present in <opencv_src>/apps.
OS - Ubuntu 16.06 LTS

Versions 3.4.X worked fine.

Is this changed recently?