if(OSSIA_USE_SYSTEM_LIBRARIES)
  # KFR
  if(OSSIA_ENABLE_KFR)
    find_package(KFR)
    if(NOT TARGET kfr)
      find_library(KFR_LIBRARY NAMES kfr_dft)
      find_path(KFR_INCLUDE_DIR kfr/version.hpp)

      if(KFR_LIBRARY AND KFR_INCLUDE_DIR)
        add_library(kfr INTERFACE IMPORTED GLOBAL)
        target_include_directories(kfr SYSTEM INTERFACE ${KFR_INCLUDE_DIR})
        target_link_libraries(kfr INTERFACE ${KFR_LIBRARY})
        set(KFR_ENABLE_DFT 0 CACHE INTERNAL "")
      endif()
    endif()
  endif()
endif()

if(NOT TARGET kfr)
  block()
    if(NOT MSVC)
      add_compile_options(-w)
    endif()
    add_subdirectory("${OSSIA_3RDPARTY_FOLDER}/kfr" "${CMAKE_CURRENT_BINARY_DIR}/kfr_build" SYSTEM)
    set_target_properties(kfr PROPERTIES UNITY_BUILD 0)
    if(TARGET kfr_dft)
      set_target_properties(kfr_dft PROPERTIES UNITY_BUILD 0)
    endif()
  endblock()
endif()

if(KFR_ENABLE_DFT)
  set(OSSIA_FFT KFR_DOUBLE CACHE INTERNAL "")
  set(OSSIA_FFT_KFR 1 CACHE INTERNAL "")
else()
  set(OSSIA_FFT_KFR 0 CACHE INTERNAL "")
endif()