Install this version:
emerge -a =dev-python/gsm0338-1.1.0# Copyright 2021-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DISTUTILS_USE_PEP517=poetry-core
PYTHON_COMPAT=( python3_{12..15} )
inherit distutils-r1 pypi
DESCRIPTION="GSM 03.38 codec"
HOMEPAGE="https://pypi.org/project/gsm0338/ https://github.com/dsch/gsm0338"
LICENSE="MIT"
SLOT="0"
KEYWORDS="amd64 ~x86"