Define variables with path and name of kernel.json file

CMakeLists.txt

@@ -135,8 +135,10 @@ foreach(var ${variables})
 endforeach()
 
 #---Make sure the Jupyter ROOT C++ kernel runs with the same Python version as ROOT-----
-configure_file(${CMAKE_SOURCE_DIR}/etc/notebook/kernels/root/kernel.json.in ${CMAKE_BINARY_DIR}/etc/notebook/kernels/root/kernel.json)
-install(FILES ${CMAKE_BINARY_DIR}/etc/notebook/kernels/root/kernel.json DESTINATION ${CMAKE_INSTALL_PREFIX}/etc/notebook/kernels/root/)
+set(root_kernel_dir  etc/notebook/kernels/root)
+set(root_kernel_file kernel.json)
+configure_file(${CMAKE_SOURCE_DIR}/${root_kernel_dir}/${root_kernel_file}.in ${CMAKE_BINARY_DIR}/${root_kernel_dir}/${root_kernel_file})
+install(FILES ${CMAKE_BINARY_DIR}/${root_kernel_dir}/${root_kernel_file} DESTINATION ${CMAKE_INSTALL_PREFIX}/${root_kernel_dir})
 
 #---Move (copy) directories to binary tree------------------------------------------------------
 set(stamp_file ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/move_artifacts.stamp)