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Not sure if you were trying to build the latest stable version (Sage 8.2) or the latest development version (Sage 8.3.rc0).

Note also that Fedora 28 currently packages Sage 8.0, see

• SageMath package in Fedora

Issues with building under Fedora 28 sometimes give rise to tickets, see:

• Sage Trac tickets whose summary contains "Fedora"

In particular

• Sage Trac ticket 25391: SageMath fails to build on on Fedora 28 with gcc 8.1

was fixed in the second half of June 2018.

If you were building Sage 8.2, I would suggest building Sage 8.3.rc0 instead.