message: Invoke find_library for Vulkan only on macOS.
diff: @@ -253,12 +253,14 @@ endif()
  # "bluevk" and "samples" targets.
  # ==================================================================================================
  +if (FILAMENT_SUPPORTS_VULKAN AND APPLE)
  find_library(Vulkan_LIBRARY NAMES vulkan HINTS "$ENV{VULKAN_SDK}/lib" "$ENV{VULKAN_SDK}/macOS/lib")
  if (Vulkan_LIBRARY)
  set(Vulkan_FOUND ON)
  message(STATUS "Found Vulkan library in SDK: ${Vulkan_LIBRARY}.")
  add_definitions(-DFILAMENT_VKLIBRARY_PATH=\"${Vulkan_LIBRARY}\")
  endif()
  +endif()
  # ==================================================================================================
  # Sub-projects
  