pkgconf_tuple_parse
char *kvdepends = pkgconf_tuple_parse(client, &pkg->vars, depends, pkg->flags);
char *repstr = pkgconf_tuple_parse(client, vars, value, flags);
PKGCONF_API char *pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *list, const char *value, unsigned int flags);
*dest = pkgconf_tuple_parse(client, &pkg->vars, value, pkg->flags);
p = pkgconf_tuple_parse(client, &pkg->vars, value, pkg->flags);
tuple->value = pkgconf_tuple_parse(client, list, dequote_value, flags);
parsekv = pkgconf_tuple_parse(client, vars, kv, flags);