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VULKAN_HEADERS_INSTALL was added since it was believed there was a valid use case for it. After looking into the use case that provoked this change there is no reason to keep VULKAN_HEADERS_INSTALL as an option. Here is the use case we do NOT want to support: https://github.com/KhronosGroup/Vulkan-Headers/pull/416#issuecomment-1622318949 Fundamentally this problem is caused add_subdirectory/find_package not being able to work together flawlessly. Which isn't the responsibility of Vulkan-Headers to fix. It's the responsibility of projects that consume Vulkan-Headers to account for either method. As described by the CMake maintainers: https://discourse.cmake.org/t/idiomatic-way-to-handle-packages-and-add-subdirectory/8400