if(PROJECT_ENABLE_VORBIS)
  if(PROJECT_BUILD)
    find_package(Vorbis ${VORBIS_VERSION} REQUIRED)

    add_definitions(-DPROJECT_ENABLE_VORBIS)

    include_directories(BEFORE SYSTEM
      ${VORBIS_INCLUDE_DIRS}
    )

    link_libraries(
      Vorbis::vorbis
    )
  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
    ExternalProject_Add(vorbis_project
      PREFIX external
      URL ${PROJECT_3RD_PARTY_DIR}/vorbis-v${VORBIS_VERSION}.tar.gz
      URL_HASH SHA256=270c76933d0934e42c5ee0a54a36280e2d87af1de3cc3e584806357e237afd13
      PATCH_COMMAND ${PROJECT_3RD_PARTY_DIR}/vorbis_patch.sh ${PROJECT_3RD_PARTY_DIR} ${CMAKE_BINARY_DIR}/external/src/vorbis_project
      LIST_SEPARATOR |
      CMAKE_ARGS ${PROJECT_EXTERNAL_CMAKE_FLAGS}
        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
        -DBUILD_STATIC_LIBS=ON
    )

    set(PROJECT_DEPENDENCIES 
      ${PROJECT_DEPENDENCIES}
      vorbis_project
    )

    add_dependencies(vorbis_project ogg_project)
  endif()
endif()