Manual Section... (3) - page: FcConfigFilename
NAMEFcConfigFilename - Find a config file
Given the specified external entity name, return the associated filename. This provides applications a way to convert various configuration file references into filename form.
A null or empty name indicates that the default configuration file should be used; which file this references can be overridden with the FC_CONFIG_FILE environment variable. Next, if the name starts with ~, it refers to a file in the current users home directory. Otherwise if the name doesn't start with '/', it refers to a file in the default configuration directory; the built-in default directory can be overridden with the FC_CONFIG_DIR environment variable.
Fontconfig version 2.6.0
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Time: 15:27:18 GMT, June 11, 2010