function(downloadCEF version download_dir)
    set(CEF_DIST "cef_binary_${version}_linux64")
    set(CEF_DOWNLOAD_DIR "${download_dir}")
    set(CEF_ROOT "${CEF_DOWNLOAD_DIR}/cef" CACHE INTERNAL "CEF_ROOT")

    if(CleanCefDownload)
        execute_process(
            COMMAND rm -rf "${CEF_DOWNLOAD_DIR}"
        )
    endif()
    if(CleanCefBuild)
        execute_process(
            COMMAND rm -rf "${CEF_ROOT}"
        )
    endif()

    if(NOT IS_DIRECTORY "${CEF_ROOT}")
        execute_process(
            COMMAND mkdir -p "${CEF_ROOT}"
        )
    endif()

    set(CEF_DOWNLOAD_FILENAME "${CEF_DIST}.tar.bz2")
    set(CEF_DOWNLOAD_PATH "${CEF_DOWNLOAD_DIR}/cef.tar.bz2")
    set(CEF_DOWNLOAD_URL "http://opensource.spotify.com/cefbuilds/${CEF_DOWNLOAD_FILENAME}")

    #download CEF bin...
    if(IS_DIRECTORY "${CEF_DOWNLOAD_DIR}")
        if(NOT IS_DIRECTORY "${CEF_ROOT}")
            if(NOT EXISTS "${CEF_DOWNLOAD_PATH}")
                message(STATUS "Downloading ${CEF_DOWNLOAD_FILENAME}...")
                file(
                        DOWNLOAD "${CEF_DOWNLOAD_URL}" "${CEF_DOWNLOAD_PATH}"
                        SHOW_PROGRESS
                )
            endif()
        endif()
    endif()

           #execute_process(
           #     COMMAND wget  "${CEF_DOWNLOAD_URL}"  -O "${CEF_DOWNLOAD_PATH}"
            #)

            #extract
        file(GLOB CEF_COSE "${CEF_ROOT}/CMakeLists.txt")
        if(NOT NoExtractCefBin OR NOT "${CEF_COSE}")
              message(STATUS "Extracting Chromium Embedded Framework...")
                execute_process(
                       COMMAND rm -rf "${CEF_ROOT}/*"
                       COMMAND tar -xf "${CEF_DOWNLOAD_DIR}/cef.tar.bz2" -C "${CEF_ROOT}" --strip-components=1
               )
        endif()
        set(IS_PATCHED "${CEF_ROOT}/PATCHED")
        if(NOT EXISTS "${IS_PATCHED}")
       message(STATUS "Patching CEF sources")
       execute_process(
                COMMAND  sh "${CMAKE_MODULE_PATH}/patchCmake.sh" "${CEF_ROOT}" && touch "${IS_PATCHED}"
                )
        endif()
endfunction()