O2 aliBuild fails at Building Python@v3.6.10

O2 experts,

We are trying to builld the O2 with

aliBuild build O2 --defaults O2

(devtoolset-7 enabled, aliBuild init executed)

The AliceO2 commit is HEAD detached at e75f547, tag v1.3.0.

The error message is:

==> Building Python@v3.6.10
==> Python is being built (use --debug for full output): failed
ERROR: Error while executing /home/shiming/alice/sw/SPECS/slc7_x86-64/Python/v3.6.10-1/build.sh on `iftmikro0229602'.
ERROR: Log can be found in /home/shiming/alice/sw/BUILD/Python-latest/log
ERROR: Please upload it to CERNBox/Dropbox if you intend to request support.
ERROR: Build directory is /home/shiming/alice/sw/BUILD/Python-latest/Python.

The log has been uploaded to https://cernbox.cern.ch/index.php/s/LYD1IoQAJLzlDhw

Thanks in advance,