FcCharSetAddChar − Add a character to a charset
#include <fontconfig/fontconfig.h>
FcBool FcCharSetAddChar (FcCharSet *fcs, FcChar32 ucs4);
FcCharSetAddChar adds a single Unicode char to the set, returning FcFalse on failure, either as a result of a constant set or from running out of memory.
Fontconfig version 2.10.95