Comment (by Roland Haas):

Unfortunately this is not quite enough information to deduce what is failing, there likely is an error message further up.

Could you take a look at the instructions at http://einsteintoolkit.org/support.html#general-guidelines-for-questions and try and attach the log files mentioned there, please?

--
Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2788/et-building-error