I noticed that $XDG_CONFIG_HOME is not set to $HOME/.config which is a convention in most modern Linux distributions AFAIK.
Is this an oversight or are user configurations also supposed to go into the nix store?
XDG_CONFIG_HOME has to default to $HOME/.config according to the specification, so I do not think setting it to that would provide any upside?
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Hmm, you’re right. I think I got confused by the statement made by the Byobu Documentation
Note that BYOBU_CONFIG_DIR=$XDG_CONFIG_HOME/byobu if defined, and $HOME/.byobu otherwise.
It does not follow the XDG Base Directory Specification then, because it should just use $HOME/.config/byobu by default, right?
Yeah, that sounds strange. At least tmux correctly reads ~/.config/tmux/tmux.conf for me. 
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Yes, that’s upstream not following the specification.
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