pkgconf_dependency_unref
pkgconf_dependency_unref(dep2->owner, dep2);
pkgconf_dependency_unref(dep->owner, dep);
pkgconf_dependency_unref(dep->owner, dep);
PKGCONF_API void pkgconf_dependency_unref(pkgconf_client_t *client, pkgconf_dependency_t *dep);
pkgconf_dependency_unref(client, depnode);
pkgconf_dependency_unref(dep->owner, dep);