fontconfig/ directory is created in some directories (not in $HOME directory).
Debian Linux 9 "stretch".
Can you provide more information? where is it? when was it created? what did the debian maintainer say about it?
It was created in /home/porton/math/mybooks/volume-1-latex (where I hold LaTeX files of my book).
Maybe it was created when I ran LaTeX editor Kile.
I haven't asked a Debian maintainer, because I don't know which package to blame.
in that directory only? does it contain any files? what happens when you run your apps once removing that directory?
I guess... it was created to store the fontconfig cache files because there was *no* cache directory found and $XDG_CACHE_HOME was somehow set there by someone (maybe your apps or you). I don't even know why but there are nothing wrong on the behavior itself if my guess is correct. when the next step to take an action for you should be to blame your app (or you) why they override $XDG_CACHE_HOME instead of the standard location where is $HOME/.cache.
Yes it contained some binary cache files.
Nothing special happens when I remove that directory. But it is recreated by some app.
I have also:
$XDG_CACHE_HOME is unset
(In reply to Victor Porton from comment #4)
This one is correct. anyway, I can't say too much until you can reprocude it. there are no such bugs so far unless there are misconfiguration in $XDG_CACHE_HOME or fonts.conf.
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