Thank you so much for helping us out! You were right, CGAL were not
properly configured on the server.
Instead of building everything from source on CentOS7, I built
graph-tool-2.8 instead of the latest release, following the step-by-step
https://gist.github.com/sbonner0/2138f2e3e2b249df51c765e1656f9d48. I hope
this link will help others in similar situations.
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