Run it without testing. Tests are on by default to allow the user to see areas that might cause issues since it interacts with many different programs during the testing process. It has been building within the last two years but requires the user to inspect any failing tests before deciding whether or not to install anyway. The difference is that the conda and pip installations do not necessarily warn the user if some tests fail. I am waiting for the next release to include the commits which fix the current incompatibility issues with python 3.11 and the recent numpy depreciation of distutils.