---
name: "FcCharSetUnion"
section: "3"
platform: "linux"
package: "fontconfig"
version: "2:2.18.3-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/FcCharSetUnion"
---

# FcCharSetUnion(3)

Add charsets

## NAME

FcCharSetUnion - Add charsets

## SYNOPSIS

**#include \<fontconfig/fontconfig.h\>**

**FcCharSet \* FcCharSetUnion (const FcCharSet \****a***, const FcCharSet \****b***);**

## DESCRIPTION

Returns a set including only those chars found in either *a* or *b*.