python config_error ai_generated true

ERROR: Could not build wheels for mypkg, which is required to install pyproject.toml-based projects × Getting requirements to build wheel did not run successfully. ╰─> [1 lines of output] BackendUnavailable: Cannot import 'setuptools.build_meta'

ID: python/pyproject-toml-missing-build-backend

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80%Fix Rate
86%Confidence
0Evidence
2024-08-30First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —
3.11 active — — —
3.12 active — — —

Root Cause

The declared PEP 517 build backend cannot be imported in the isolated build env, typically because setuptools is missing or the pyproject.toml names a backend not listed in `[build-system] requires`.

generic

中文

声明的 PEP 517 构建后端无法在隔离构建环境中导入，通常因为缺少 setuptools，或 pyproject.toml 指定的后端未列入 `[build-system] requires`。

Workarounds

  1. 90% success 
    Fix pyproject.toml so `[build-system] requires = ["setuptools>=61", "wheel"]` and `build-backend = "setuptools.build_meta"`, then rebuild.
  2. 75% success 
    Bypass isolation for a quick local build: `pip install --no-build-isolation .` after installing setuptools/wheel in the current env.

Dead Ends

Common approaches that don't work:

  1. 92% fail

    Unrelated to the backend import failure.

  2. 80% fail

    Build isolation ignores the outer env's site-packages by design.