ruamel.yaml w/out C compiler on ARM - ruamel.yaml

Question

I am trying to install ruamel.yaml on a raspberry Pi system without a C compiler and encounter a build error installing ruamel.yaml.clib (pasted below).
I see this was previously addressed for ruamel.yaml>=0.15.41, <0.16.0 (How to install ruamel.yaml w/o native extension).
Note in the output below that the path from buildroot is not valid on the device running pip install but is from the device that built the image.
$ pip install ruamel.yaml~=0.16
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting ruamel.yaml~=0.16
Using cached ruamel.yaml-0.17.10-py3-none-any.whl (108 kB)
Collecting ruamel.yaml.clib>=0.1.2; platform_python_implementation == "CPython" and python_version < "3.10"
Using cached ruamel.yaml.clib-0.2.6.tar.gz (180 kB)
ERROR: Command errored out with exit status 1:
command: /usr/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-2t0ptfu4/ruamel-yaml-clib/setup.py'"'"'; __file__='"'"'/tmp/pip-install-2t0ptfu4/ruamel-yaml-clib/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-zdtfb19x
cwd: /tmp/pip-install-2t0ptfu4/ruamel-yaml-clib/
Complete output (3 lines):
sys.argv ['/tmp/pip-install-2t0ptfu4/ruamel-yaml-clib/setup.py', 'egg_info', '--egg-base', '/tmp/pip-pip-egg-info-zdtfb19x']
test compiling /tmp/tmp_ruamel_5les1064/test_ruamel_yaml.c -> test_ruamel_yaml compile error: /tmp/tmp_ruamel_5les1064/test_ruamel_yaml.c
Exception: command '{path from buildroot}/aarch64-buildroot-linux-gnu-gcc' failed with exit status 1
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
A preferred solution would be to have a ruamel.yaml.clib wheel for ARM architectures or to make clib dependency optional (pip install ruamel.yaml[clib])

Answer 1

I'm not sure why this broke after 0.16, but I'll try to have a look as to why this fails again (it might be that setuptools now throws a different Exception that is not caught).
Wheels for ruamel.yaml.clib in aarch64 architecture are availalbe on piwheels.
You should be able to install those after adding:
[global]
extra-index-url=https://www.piwheels.org/simple
to /etc/pip.conf.
Disclaimer: I have no control over how wheels on piwheels are generated.