Could NOT find Vulkan when cmake on MacOS

[CesiumChloride]

Hi I am trying to install VVDviewer on MacOS 10.15. I have followed the instructions and come to the very last step "cmake ../VVD_viewer -G Xcode". I got this following error
"""
CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
The package name passed to find_package_handle_standard_args (Vulkan)
does not match the name of the calling package (vulkan). 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):
/usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/Findvulkan.cmake:518 (find_package_handle_standard_args)
CMakeLists.txt:305 (find_package)
This warning is for project developers. Use -Wno-dev to suppress it.

-- Could NOT find Vulkan (missing: Vulkan_LIBRARY Vulkan_INCLUDE_DIR) (found version "")
CMake Warning (dev) at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/BundleUtilities.cmake:237 (message):
Policy CMP0080 is not set: BundleUtilities cannot be included at configure
time. Run "cmake --help-policy CMP0080" for policy details. Use the
cmake_policy command to set the policy and suppress this warning.

Call Stack (most recent call first):
/usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/BundleUtilities.cmake:246 (_warn_cmp0080)
CMakeLists.txt:401 (include)
This warning is for project developers. Use -Wno-dev to suppress it.
"""

I am wondering whether I should install Vulkan separately or there is a Vulkan coming with the VVD_viewer package.

Thank you!