Sun Aug 25 2019 15:25:01 UTC
That doesn’t happen on my machine.
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ID Product Component Assignee Status Resolution Summary Changed
239213 Ports & Packages Individual Port(s) ports-bugs New --- math/sage fails to build. (make -j must be a positive integer) 2019-07-15
One bug found.

as

File a new bug in the "Individual Port(s)" component of the "Ports & Packages" product