# ERROR: Project has a 'pyproject.toml' and its build backend is missing the 'build_editable' hook. Cannot build editable. The project's build backend 'setuptools.build_meta' does not have a 'build_editable' hook.

- **ID:** `pip/pyproject-toml-build-backend-missing`
- **Domain:** pip
- **Category:** build_error
- **Verification:** ai_generated
- **Fix Rate:** 82%

## Root Cause

The pyproject.toml specifies a build backend (e.g., setuptools.build_meta) that does not support the 'build_editable' hook, required for 'pip install -e .' with modern pip.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| pip 24.1 | active | — | — |
| setuptools 68.0 | active | — | — |
| Python 3.11 | active | — | — |

## Workarounds

1. **Upgrade setuptools to version 64+ which supports build_editable: 'pip install --upgrade setuptools>=64' then retry editable install.** (85% success)
   ```
   Upgrade setuptools to version 64+ which supports build_editable: 'pip install --upgrade setuptools>=64' then retry editable install.
   ```
2. **Temporarily install without editable mode: 'pip install .' instead of 'pip install -e .'** (95% success)
   ```
   Temporarily install without editable mode: 'pip install .' instead of 'pip install -e .'
   ```
3. **Add a custom build backend in pyproject.toml that supports editable installs, e.g., use 'hatchling' or 'flit_core':
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"** (75% success)
   ```
   Add a custom build backend in pyproject.toml that supports editable installs, e.g., use 'hatchling' or 'flit_core':
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
   ```

## Dead Ends

- **** — Upgrading pip does not add the hook; the build backend must support it. (90% fail)
- **** — Deleting pyproject.toml and using setup.py directly may work but breaks build system standardization and can cause other issues. (70% fail)
- **** — Using 'pip install --no-build-isolation' does not bypass the hook requirement; it still fails. (95% fail)