Mon Feb 18 2019 18:37:04 UTC
It works better, if you plug it in.
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ID Product Component Assignee Status Resolution Summary Changed
232443 Ports & Packages Individual Port(s) ports-bugs Open --- graphics/opencv 3.4.1_8 staging failure 2018-10-20
234147 Ports & Packages Individual Port(s) ports-bugs Open --- graphics/opencv: Update to 4.0.0 2018-12-19
2 bugs found.

as

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