I ve figured out that this error is the result of the fact that find_package(hdf5 REQUIRED) produces the message:
RUNNING KKK
CMake Warning (dev) at C:/Qt/Tools/CMake_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:424 (message):
The package name passed to find_package_handle_standard_args (HDF5) does
not match the name of the calling package (hdf5). This can lead to
problems in calling code that expects find_package result variables
(e.g., _FOUND) to follow a certain pattern.
Call Stack (most recent call first):
C:/Qt/Tools/CMake_64/share/cmake-3.19/Modules/FindHDF5.cmake:975 (find_package_handle_standard_args)
C:/S/d/VTK/CMake/FindHDF5.cmake:9 (include)
KKK/CMakeLists.txt:10 (find_package)
This warning is for project developers. Use -Wno-dev to suppress it.
– Could NOT find HDF5 (missing: HDF5_LIBRARIES HDF5_INCLUDE_DIRS) (found version “”)
In my code now there no upper case variables HDF5 only smaller hdf5