pip 10 fails to install dependency specified in pyproject.toml

[lazka]

The package PyGObject (pre-release) contains the following pyproject.toml:

[build-system]
requires = ["setuptools", "wheel", "pycairo"]

Steps:

• pip install pygobject --pre

Expected:

• pip installs pycairo and then pygobject

Actual:

> pip install pycairo                  
Requirement already satisfied: pycairo in ./foo/lib/python3.6/site-packages (1.17.0)
> pip install pygobject --pre 
Collecting pygobject
  Using cached PyGObject-3.29.1.dev0.tar.gz
  Could not find a version that satisfies the requirement pycairo (from versions: )
No matching distribution found for pycairo

[pfmoore]

pycairo doesn't support installing PEP 518 dependencies from source (yet). See https://pip.pypa.io/en/latest/reference/pip/#pep-518-support which explains the current limitations of pip's PEP 518 support.

[lazka]

Thanks, I see. Providing wheels for pycairo is a bit hard because it links against other libraries with varying build configuration.

In my example above pip did build a wheel for pycairo first, so it wouldn't have to build from source theoretically.

Feel free to close this.

[jackton1]

Temporary Fix

Upgrade pip using.

curl https://bootstrap.pypa.io/get-pip.py | python3

Instead of pip install -U pip

[lazka]

@jackton1 ?

[lazka]

Closing as a duplicate of #5229

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.