Mac install problem: conflicting dependencies

[lucasgonze]

Description

configure script throws error:

Cannot install scancode-toolkit==30.1.0 because these package versions have conflicting dependencies.

The conflict is caused by:
    scancode-toolkit 30.1.0 depends on lxml<5.0.0 and >=4.6.3
    The user requested (constraint) lxml==4.6.3

How To Reproduce

See
log.txt

1. Download "scancode-toolkit-30.1.0" (latest at this moment).
2. Unpack tarball, cd into it
3. vi PYTHON_EXECUTABLE and set python version (in my case python means Python 3.9.9)
4. ./scancode --help
5. Get error "ERROR: Cannot install scancode-toolkit==30.1.0 because these package versions have conflicting dependencies."

System configuration

Mac OS X Monterey v12.1

scancode-toolkit-30.1.0

Python 3.9.9

Installation method: downloaded scancode-toolkit-30.1.0_py36-macos.tar.xz

[pombredanne]

Thank for the report . Sorry for this bug!
There is likely some heisenbug-like condition in Python pip which I am tracking down.... Unless this is a macOS 12 issue? or just a macOS issue.
This is really weird as I just tracked a similar issue on macOS 11 on Friday with @DennisClark

[pombredanne]

I was just filling this pypa/pip#10824

[lucasgonze]

It might be related that the system I'm using is noticeably slow. It's a 2017 Air running Monterey and Docker. This tends to trigger race conditions.

So try running something which overloads your hardware.

[DennisClark]

I have encountered the same problem on a MacBook Pro (16-inch, 2019) with a 2.6 GHz 6-Core Intel Core I7, and 16 GB RAM.

[pombredanne]

@DennisClark Thanks

@lucasgonze the short term workaround should be this, once the ./scancode --help above failed:

1. run source bin/activate
2. run pip install --editable .
   (This will fetch wheels live from PyPI though)

[DennisClark]

@pombredanne i confirmed that the short term workaround is helpful in my installation, thanks. And it means that I can now report other issues :-)

[lucasgonze]

@pombredanne i confirmed that the short term workaround is helpful in my installation, thanks. And it means that I can now report other issues :-)

Ditto. Ibid. What he said.

[pombredanne]

@lucasgonze I want to keep this open until we have a proper fix with pip