Error installing O2 and O2Physics

Hi @kwoo, are you sure you followed all of the steps? The page you give links to:

https://alice-doc.github.io/alice-analysis-tutorial/building/custom.html

…and specifically, that tells you that to build on Ubuntu 20.04, you need to install some system packages:

https://alice-doc.github.io/alice-analysis-tutorial/building/prereq-ubuntu.html

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