# error: Cython does not appear to be installed. Please install Cython to compile this package.

- **ID:** `python/setuptools-cython-required`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The package uses Cython extensions but Cython is not installed in the build environment.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |
| 3.11 | active | — | — |
| 3.12 | active | — | — |

## Workarounds

1. **Install Cython before building the package** (90% success)
   ```
   pip install cython && pip install mypackage
   ```
2. **Use a pre-compiled wheel if available** (80% success)
   ```
   pip install mypackage --only-binary :all:
   ```

## Dead Ends

- **Installing only the binary wheel** — If no wheel is available, pip will try to build from source. (70% fail)
- **Using --no-build-isolation** — This may help but still requires Cython to be pre-installed. (60% fail)