Installing Pillow from remote archive in Linux Flatpak

[ChrisOfBristol]

This worked on my PC, but to make the Flatpak work I had put this parameter back "--prefix=${FLATPAK_DEST}" presumably to ensure that it is installed in the correct Flatpak directory.

modules:
  - name: python3-pillow
    buildsystem: simple
    build-commands:
      - pip3 install . --prefix=${FLATPAK_DEST}
    sources:
      - type: archive
        url: https://github.com/python-pillow/Pillow/archive/refs/tags/8.3.2.tar.gz
        sha256: 8252b6b514aed2743abb5b7259b3253d6c4bf86902b9c5acd33fe79d24ec7b2f

Can I ignore this warning?

Successfully installed Pillow-8.3.2
  WARNING: There was an error checking the latest version of pip.