Eli's hunch was correct, it had to do with the RCS tool I used, which was from Cygwin. I installed the binaries Eli pointed to and made sure those were found earlier in the PATH and not it seems to work.

Also, I was a bit embarrassed when I understood that RCS was not an internal tool in Emacs... I don't know why, but I got the impression that Emacs was handling the RCS stuff internally, so I never suspected that there would be external tools.

Thanks!

/Mathias


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