This returns the number of fonts which would be included in the return from
FcCacheCopySet.
@@
+
+@RET@ FcBool
+@FUNC@ FcDirCacheClean
+@TYPE1@ const FcChar8 * @ARG1@ cache_dir
+@TYPE2@ FcBool @ARG2@ verbose
+@PURPOSE@
+This tries to clean up the cache directory of <parameter>cache_dir</parameter>.
+This returns FcTrue if the operation is successfully complete. otherwise FcFalse.
+@SINCE@ 2.9.91
+@@
+
+@RET@ void
+@FUNC@ FcCacheCreateTagFile
+@TYPE1@ const FcConfig * @ARG1@ config
+@PURPOSE@ Create CACHEDIR.TAG at cache directory.
+@DESC@
+This tries to create CACHEDIR.TAG file at the cache directory registered
+to <parameter>config</parameter>.
+@SINCE@ 2.9.91
+@@