With the Docker images I use for Racket, gregor installs fine. I ran the command `docker run -it jackfirth/racket:6.11 raco pkg install --auto gregor` and it completed without error. You can find the dockerfile being used to produce those images in the Github repo <https://github.com/jackfirth/racket-docker/blob/master/racket.Dockerfile>. Maybe there's something off with the dockerfile you're using?
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