Sun Aug 25 2019 00:22:33 UTC
I've stopped it crashing. It was bombing out at an 'assert' line,. Removing it fixed it!
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ID Product Component Assignee Status Resolution Summary Changed
237682 Ports & Packages Individual Port(s) ports-bugs New --- net/liblinphone: build failure on CURRENT and 12-STABLE 2019-05-01
One bug found.

as

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