if [ $USE_THREADS = "rfork" ]; then

    have=NGX_THREADS . auto/have
    have=NGX_USE_RFORK . auto/have
    CORE_DEPS="$CORE_DEPS $UNIX_THREADS_DEPS"
    CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_SRCS"

    if [ $version -lt 501000 ]; then
        CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_THREAD_SRCS"
    fi

fi