Provided by: libfontconfig-doc_2.13.1-4.2ubuntu5_all 

NAME
FcLangSetUnion - Add langsets
SYNOPSIS
#include <fontconfig/fontconfig.h> FcLangSet * FcLangSetUnion (const FcLangSet *ls_a, const FcLangSet *ls_b);
DESCRIPTION
Returns a set including only those languages found in either ls_a or ls_b.
SINCE
version 2.9.0 Fontconfig 2.13.1 23 March 2022 FcLangSetUnion(3)