Thanks! I've pushed a change based on your explanation. I was able to
confirm that it made the `XDG_CONFIG_HOME` environment take effect when
it previously did not, at least.

At Fri, 25 Jun 2021 15:44:53 -0700 (PDT), pastel raschke wrote:
> Racket seems to insist on using ~/.racket as its special place, despite the 
> apparent fix that added XDG compliance. This happens even when I have 
> racket folders neatly set up in all my xdg dirs, and clear ~/.racket* every 
> time.
> 
> Stepping through in a debugger, I found the problem was at line 2038 of 
> rktio_fs.c, where rktio_system_path calls rktio_expand_user_tilde on 
> prefer_home_str. When prefer_home_str is set from an appropriate XDG 
> environment variable, it is specifically checked to be an absolute path by 
> starting with a slash, where the default prefer_home_str starts with a 
> tilde.
> 
> This wouldn't be a problem if rktio_expand_user_tilde did not respond to an 
> absolute path by setting RKTIO_ERROR_NO_TILDE and returning null, or if the 
> error were caught in rktio_system_path and prefer_home were set properly, 
> or if prefer_home_str were not tilde expanded after being set to an 
> absolute path at line 2008 in the first place. The current behavior results 
> in the non-compliant ~/.racket being used, to my great frustration.
> 
> Thank you for your work.
> 
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