PEP-517 build does not match poetry.lock

[ipmb]

• [x] I am on the latest Poetry version.
• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [ ] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: MacOS 10.14.4
• Poetry version: 0.12.12
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/ipmb/7acf540e1bad06c4812ad329326c0ad3

Issue

If I try to pip install . a project with this pyproject.toml I get the error:

ERROR: requests 2.21.0 has requirement urllib3<1.25,>=1.21.1, but you'll have urllib3 1.25.1 which is incompatible.

poetry.lock is correctly pinned to urllib3==1.24.2, but pip installs urllib3==1.25.1.

Should I expect the pip build-system to use dependencies from poetry.lock or can it only work against the dependencies as defined in the pyproject.toml?

[sdispater]

Pip only understands build systems specified in pyproject.toml and has no notion of what's inside poetry.lock

[github-actions[bot]]

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