Celestia

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function(EnableWinICU)
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  # https://learn.microsoft.com/en-us/windows/win32/intl/international-components-for-unicode--icu-
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  # https://learn.microsoft.com/en-us/windows/win32/winprog/using-the-windows-headers
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  # Combined header/library - requires Windows 10 1903
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  try_compile(
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    HAVE_WIN_ICU
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    ${CMAKE_BINARY_DIR}
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    "${CMAKE_SOURCE_DIR}/checks/winicu.cpp"
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    LINK_LIBRARIES icu
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  )
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  set(WINVER 0x0A00 PARENT_SCOPE)
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  if(HAVE_WIN_ICU)
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    set(NTDDI_VER 0x0A000007 PARENT_SCOPE)
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    add_definitions(-DHAVE_WIN_ICU)
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    link_libraries("icu")
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    message(STATUS "Found ICU with combined header and combined lib")
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    return()
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  else()
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    message(FATAL_ERROR "Unable to find Windows SDK's ICU implementation")
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  endif()
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endfunction()
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