Installation fails on MacOS (conflicting dependencies)

🐛 Bug Report

python3 -m pip install --user -U demucs command fails on MacOS.

Running:

• BigSur v11.6 on M1 chip
• Python 3.10.1 with pip-21.3.1

To Reproduce

1. Run python3 -m pip install --user -U demucs

Expected behavior

Returns

Collecting demucs
  Using cached demucs-3.0.1.tar.gz (1.5 MB)
  Preparing metadata (setup.py) ... done
Collecting dora-search
  Using cached dora_search-0.1.7.tar.gz (68 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Collecting demucs
  Using cached demucs-3.0.0.tar.gz (1.5 MB)
  Preparing metadata (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /Library/Frameworks/Python.framework/Versions/3.10/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_3d8567b52f024f7a8b8e2e3c8e5db5d6/setup.py'"'"'; __file__='"'"'/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_3d8567b52f024f7a8b8e2e3c8e5db5d6/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-pip-egg-info-92s0nt5s
       cwd: /private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_3d8567b52f024f7a8b8e2e3c8e5db5d6/
  Complete output (7 lines):
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_3d8567b52f024f7a8b8e2e3c8e5db5d6/setup.py", line 39, in <module>
      REQUIRED = load_requirements('requirements_minimal.txt')
    File "/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_3d8567b52f024f7a8b8e2e3c8e5db5d6/setup.py", line 34, in load_requirements
      required = [i.strip() for i in open(HERE / name)]
  FileNotFoundError: [Errno 2] No such file or directory: '/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_3d8567b52f024f7a8b8e2e3c8e5db5d6/requirements_minimal.txt'
  ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/5b/a5/d29ca8f45f1d6dc814d595b9874cb209d45e97c1bbfb41c48968be2e1231/demucs-3.0.0.tar.gz#sha256=d91beb476dfec0362a531a935429f429f3f8dae0d0772da3efb4fad73e9116d2 (from https://pypi.org/simple/demucs/) (requires-python:>=3.7.0). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  Using cached demucs-2.0.3.tar.gz (51 kB)
  Preparing metadata (setup.py) ... done
Collecting diffq>=0.1
  Using cached diffq-0.2.0.tar.gz (39 kB)
  Preparing metadata (setup.py) ... done
Collecting demucs
  Using cached demucs-2.0.2.tar.gz (51 kB)
  Preparing metadata (setup.py) ... done
  Using cached demucs-2.0.1.tar.gz (51 kB)
  Preparing metadata (setup.py) ... done
  Using cached demucs-2.0.0.tar.gz (45 kB)
  Preparing metadata (setup.py) ... done
  Using cached demucs-0.0.2.tar.gz (45 kB)
  Preparing metadata (setup.py) ... done
  Using cached demucs-0.0.1.tar.gz (45 kB)
  Preparing metadata (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /Library/Frameworks/Python.framework/Versions/3.10/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_0a29a721dbf14a6384fcc442088ce467/setup.py'"'"'; __file__='"'"'/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_0a29a721dbf14a6384fcc442088ce467/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-pip-egg-info-n7xrmiyp
       cwd: /private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_0a29a721dbf14a6384fcc442088ce467/
  Complete output (5 lines):
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_0a29a721dbf14a6384fcc442088ce467/setup.py", line 25, in <module>
      REQUIRED = [i.strip() for i in open(HERE / "requirements.txt")]
  FileNotFoundError: [Errno 2] No such file or directory: '/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_0a29a721dbf14a6384fcc442088ce467/requirements.txt'
  ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/f0/0b/ebb129e8724e8822e8f94e231118109f73b4a77ff76d47142e0fced854d7/demucs-0.0.1.tar.gz#sha256=76841228f4befedd0e94387c0a0f03e0b3ab8aacf40001a8f4b062b28160535d (from https://pypi.org/simple/demucs/) (requires-python:>=3.7.0). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  Using cached demucs-0.0.0.tar.gz (1.5 kB)
  Preparing metadata (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /Library/Frameworks/Python.framework/Versions/3.10/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_2926f03aaabc4535a74e279043def8ca/setup.py'"'"'; __file__='"'"'/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_2926f03aaabc4535a74e279043def8ca/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-pip-egg-info-tw41krwz
       cwd: /private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_2926f03aaabc4535a74e279043def8ca/
  Complete output (5 lines):
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/private/var/folders/s0/ks_8g5zn125076cpkskl_rvc0000gn/T/pip-install-e05p_m7_/demucs_2926f03aaabc4535a74e279043def8ca/setup.py", line 19, in <module>
      REQUIRED = [i.strip() for i in open("requirements.txt")]
  FileNotFoundError: [Errno 2] No such file or directory: 'requirements.txt'
  ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/80/04/5d0473a2e1261c3789ff6083febb5f797776a42dbbe069691b9cc73c9f10/demucs-0.0.0.tar.gz#sha256=8050de572ca5806244a28130b71b81d2542a02ebb91f37ff727becd7eb03debf (from https://pypi.org/simple/demucs/) (requires-python:>=3.7.0). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Cannot install demucs==0.0.2, demucs==2.0.0, demucs==2.0.1, demucs==2.0.2, demucs==2.0.3 and demucs==3.0.1 because these package versions have conflicting dependencies.

The conflict is caused by:
    demucs 3.0.1 depends on diffq>=0.2.1
    demucs 2.0.3 depends on lameenc>=1.2
    demucs 2.0.2 depends on lameenc>=1.2
    demucs 2.0.1 depends on lameenc>=1.2
    demucs 2.0.0 depends on lameenc>=1.2
    demucs 0.0.2 depends on lameenc>=1.2

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies

Your Environment

• BigSur v11.6 on M1 chip, 16GB RAM
• Python 3.10.1 with pip-21.3.1

[adefossez]

If you installed directly using the installer from python.org, then this might help you: https://stackoverflow.com/a/53310545/2936604

[PierreMarieRiviere]

Genius. Solved. Sorry shoulda found this by myself.

Thanks for the great work + support, really excited about this tool!