Where is the quick way to rebuild O2?

Hi, you are right. O2 installation uses ninja in your alidock environment. If you want to rebuild, you can do:

alienv enter O2/latest  # need to be in the environment for that
cd ~/.sw/BUILD/O2-latest/O2
ninja install -j4

Let me know if this works for you (it does for me, for the record). I’ll update the instructions accordingly.

Cheers

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