Hi Adriano, Thank you for the patch. I tried to build python-objgraph on python-team branch and it's completed successfully. May you give it a go to test on your end please? --8<---------------cut here---------------start------------->8--- > ./pre-inst-env guix build python-objgraph -q --rounds=2 --check /gnu/store/v49q59cyddfy811fr50y04pm0ywwwslq-python-objgraph-3.6.2 --8<---------------cut here---------------end--------------->8--- -- Oleg