xephem seg faults on Mojave

[Richard L. Hamilton]

It doesn't have to be a bug with xephem (the code) at all, but with the build procedure, which apparently can have a lot of breakage going to Xcode 10.

> On Oct 11, 2018, at 04:30, Chris Jones <jonesc at hep.phy.cam.ac.uk> wrote:
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> 
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>> The same version of Xephem ran fine on 10.13 when using the Fink packaging system, so I’m far from convinced it is a bug in Xephem.
> 
> That statement does not follow. How does it running ok on macOS 10.13 mean it does not have a bug only affecting macOS 10.14 ?
>