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 <jon...@hep.phy.cam.ac.uk> wrote: > > > >> 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 ? >