option --use-feature: invalid choice: 'in-tree-build' (choose from '2020-resolver', 'fast-deps')

[kravrolens]

As described in create_env.sh, we use conda to create envs, When I ran pip install . --upgrade --use-feature=in-tree-build, it prints:

Usage:
pip install [options] [package-index-options] ... pip install [options] -r [package-index-options] ... pip install [options] [-e] ... pip install [options] [-e] ... pip install [options] <archive url/path> ... option --use-feature: invalid choice: 'in-tree-build' (choose from '2020-resolver', 'fast-deps')

Then ran with pip install . --upgrade --use-feature=2020-resolver', it turns out:

WARNING: --use-feature=2020-resolver no longer has any effect, since it is now the default dependency resolver in pip. This will become an error in pip 21.0. Preparing metadata (setup.py) ... done Building wheels for collected packages: svox2 Building wheel for svox2 (setup.py) ... error error: subprocess-exited-with-error

× python setup.py bdist_wheel did not run successfully. │ exit code: 1 ╰─> [18 lines of output]

...

note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for svox2 Running setup.py clean for svox2 Failed to build svox2 Installing collected packages: svox2 Running setup.py install for svox2 ... error error: subprocess-exited-with-error

× Running setup.py install for svox2 did not run successfully. │ exit code: 1 ╰─> [31 lines of output]

......

note: This error originates from a subprocess, and is likely not a problem with pip. error: legacy-install-failure

× Encountered error while trying to install package. ╰─> svox2

note: This is an issue with the package mentioned above, not pip. hint: See above for output from the failure.

Many THX!

[m-mousatat]

how did you fix this error?