This is an auto-filed bug because dev-python/mygpoclient calls commands that do not exist.
The issue was originally discovered on amd64, but it may be reproducible on other arches as well.
If you think that a different summary clarifies the issue better, feel free to change it.
Attached build log and emerge --info.
Created attachment 640126 [details]
build log and emerge --info
>>> Test phase: dev-python/mygpoclient-1.8
* python3_7: running distutils-r1_run_phase python_test
/var/tmp/portage/dev-python/mygpoclient-1.8/temp/environment: line 3004: nosetests: command not found
* python3_7: running distutils-r1_run_phase _distutils-r1_clean_egg_info
>>> Completed testing dev-python/mygpoclient-1.8
and appropriately modifying DEPEND would work.