#include <fontconfig.h>
FcBool FcStrSetAddFilename(FcStrSet *set, const FcChar8 *s);
FcBool FcStrSetAddFilename
Adds a copy s to set, The copy is created with FcStrCopyFilename so that leading '~' values are replaced with the value of the HOME environment variable.
Fontconfig version 2.8.0