# ERROR: Some build dependencies for package from https://... are missing: 'setuptools>=40.8.0' is not installed.

- **ID:** `python/pip-install-requires-build-deps`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The package's pyproject.toml specifies build dependencies that are not present in the isolated build environment. pip attempts to install them but may fail due to network or resolver issues.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   pip install setuptools>=40.8.0 wheel cython  # then pip install package
   ```
2. **** (85% success)
   ```
   pip install -r build-requirements.txt && pip install package --no-build-isolation
   ```

## Dead Ends

- **** — Requires the build dependencies to be already installed; if not, the error persists. (75% fail)
- **** — Other build dependencies may also be missing; installing only setuptools is incomplete. (60% fail)