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       FcDirCacheValid - check directory cache timestamp
       #include <fontconfig.h>
       FcBool FcDirCacheValid (const FcChar8 *cache_file);
       Returns  FcTrue if cache_file is no older than the directory containing
       it, else FcFalse.
       Fontconfig version 2.2.0
                                 21 April 2003              FcDirCacheValid(3)