Bug report

Bug description:

PEP 739 specifies that the CPython header directory is included in the c_api.headers key. However, it seems that the implemented that landed in #130069 uses c_api.include instead:

{
  ...
  "c_api": {
    "include": "/usr/include",
    "pkgconfig_path": "/usr/lib64/pkgconfig"
  }
}

I don't see any evidence that the name was changed deliberately. In fact, the code seems to be mixing both include and headers names:

CPython versions tested on:

3.14, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-134455: Fix build-details.json to use the c_api.headers key #134456
• [3.14] gh-134455: Fix build-details.json to use the c_api.headers key (GH-134456) #134504