Provided by: libfontconfig1-dev_2.12.6-0ubuntu2_amd64 

NAME
FcLangSetSubtract - Subtract langsets
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcLangSet * FcLangSetSubtract (const FcLangSet *ls_a, const FcLangSet *ls_b);
DESCRIPTION
Returns a set including only those languages found in ls_a but not in ls_b.
SINCE
version 2.9.0
Fontconfig 2.12.6 05 April 2018 FcLangSetSubtract(3)