Provided by: libfontconfig1-dev_2.12.6-0ubuntu2_amd64 

NAME
FcConfigGetCache - DEPRECATED used to return per-user cache filename
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcChar8 * FcConfigGetCache (FcConfig *config);
DESCRIPTION
With fontconfig no longer using per-user cache files, this function now simply returns NULL to indicate
that no per-user file exists.
Fontconfig 2.12.6 05 April 2018 FcConfigGetCache(3)