Provided by: libfontconfig1-dev_2.13.1-2ubuntu3_amd64 

NAME
FcObjectSetAdd - Add to an object set
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcBool FcObjectSetAdd (FcObjectSet *os, const char *object);
DESCRIPTION
Adds a property name to the set. Returns FcFalse if the property name cannot be inserted into the set
(due to allocation failure). Otherwise returns FcTrue.
Fontconfig 2.13.1 06 April 2020 FcObjectSetAdd(3)