Provided by: libfontconfig-doc_2.15.0-2.3ubuntu1_all 
NAME
FcStrSetAdd - add to a string set
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcBool FcStrSetAdd (FcStrSet *set, const FcChar8 *s);
DESCRIPTION
Adds a copy of s to set.
Fontconfig 2.15.0 04 July 2025 FcStrSetAdd(3)