# ERROR: Could not build wheels for package, which use PEP 517 and cannot be installed directly

- **ID:** `python/setuptools-missing-build-backend`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The package uses a PEP 517 build backend but the required build dependency (e.g., setuptools, wheel, or a custom backend) is not installed in the isolated build environment.

## Version Compatibility

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

## Workarounds

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

## Dead Ends

- **** — Disabling build isolation requires the build backend to already be installed in the current environment; if it isn't, the error persists. (70% fail)
- **** — Upgrading pip does not install the missing build backend specified in pyproject.toml [build-system].requires. (80% fail)