FcConfigAppFontAddDir − Add fonts from directory to font database
#include <fontconfig/fontconfig.h>
FcBool FcConfigAppFontAddDir (FcConfig *config, const FcChar8 *dir);
Scans the specified directory for fonts, adding each one found to the application-specific set of fonts. Returns FcFalse if the fonts cannot be added (due to allocation failure). Otherwise returns FcTrue. If config is NULL, the current configuration is used.