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       FcDirSave - save a directory cache
       #include <fontconfig.h>
       FcBool FcDirSave (FcFontSet *set, FcStrSet *dirs, const char *dir);
       Creates  the per-directory cache file for dir and populates it with the
       fonts in set and subdirectories in dirs.
       Fontconfig version 2.2.0
                                 21 April 2003                    FcDirSave(3)