I have merged the pull request, but I am now receiving regular e-mail from Github telling me that the builds have failed:
Run failed for master (f043bf6)
Repository: jamespetts/simutrans-extended
Workflow: CI
Duration: 4 minutes and 20.0 seconds
Finished: 2020-08-16 11:36:31 UTC
View results
Jobs:
Code Formatting succeeded (0 annotations)
Linux (Allegro, single-threaded) succeeded (0 annotations)
Linux (headless) failed (1 annotation)
Linux (SDL2, multi-threaded, freetype) succeeded (0 annotations)
Linux (SDL1) succeeded (0 annotations)
Linux (OpenGL) succeeded (0 annotations)
Linux Makeobj succeeded (0 annotations)
Linux (SDL1 + SDL_mixer) succeeded (0 annotations)
Linux (Debug SDL2, multi-threaded) succeeded (0 annotations)
macOS Makeobj succeeded (0 annotations)
Linux Nettool succeeded (0 annotations)
macOS Nettool succeeded (0 annotations)
macOS (SDL2) failed (1 annotation)
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I am not familiar with CI setups, I am afraid, so I am not sure how to interpret this.