How to compile python3.9 and install it on openwrt?

It 's simple to compile python3.9 on debian:

    sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libsqlite3-dev libreadline-dev libffi-dev curl libbz2-dev
    wget https://www.python.org/ftp/python/3.9.1/Python-3.9.1.tgz
    tar -xf Python-3.9.1.tgz
    cd Python-3.9.1
    ./configure --enable-optimizations
    #nproc value is 4 in my pc platform
    make -j 4
    sudo make altinstall

How to compile python3.9 and install it on openwrt?

root@OpenWrt:~# cat /etc/banner
  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt 19.07.7, r11306-c4a6851c72
 -----------------------------------------------------
root@OpenWrt:~# uname -a
Linux OpenWrt 4.14.221 #0 SMP Mon Feb 15 15:22:37 2021 x86_64 GNU/Linux