Comment (by Peter Diener):

The compile of boost started and finished on Sunrise after your fix.

I encountered the missing libboost_system on Sunrise. I have my own compiled boost version 1.89 there. When I removed the check for the library I was able to compile and link the current development version of Cactus.

--
Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/1775/add-boost-to-et