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Akira TAGOH authored
cachedir is used to determine where cache files are stored. the empty directory will ends up to put them under the top of directory of XDG_CACHE_HOME. that messes it up and must be avoided. As a note, if you want to read/write something from the top of XDG_DATA_HOME (dir) and/or XDG_CACHE_HOME (cachedir), put "." instead of the empty. fontconfig/fontconfig#180
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