This is not Pants configuring things evne though it reads like that might be the case:

Configured with:
    build: False
    use_wheel: True

That's really just Pex's reaction to pants passing

--platform linux_x86_64-cp-39-cp39

which is what it does to tell Pex - "Hey, I know we're on Mac, but try to build a venv that works on Linux". Since we're on Mac, we cannot build sdists into Linux wheels without cross-building. Pex does not support cross-building and so it only allows pre-built wheels. The resolve fails since there is no pre-built wheel for

img2pdf

. You need to build one for Linux and then make it available in a

--find-links

repo for Pex to find. When using Pants you configure this with `[python-repos] repos = ...`: https://www.pantsbuild.org/docs/reference-python-repos#repos