Install Python 3.13 Dev Headers | Generated by AI

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This new error reveals the final blocker in building sentencepiece: missing Python development headers.

❌ Error:

fatal error: Python.h: No such file or directory

This means the compiler cannot find Python.h, which is necessary for compiling Python C extensions.

✅ Solution

You need to install the Python 3.13 development headers:

For Ubuntu/Debian (Python 3.13):

Since Python 3.13 is very new, if you’re using a custom build or pyenv, the headers may not be installed by default. Try one of the following:

  1. If you’re using system-wide Python 3.13 (installed from deadsnakes or source):
sudo apt install python3.13-dev
  1. If you’re using pyenv:
pyenv install 3.13.0 --with-openssl --enable-shared

And ensure your virtual environment is using this version.

🔁 Then Retry:

Once the headers are installed, try again:

pip install sentencepiece --use-pep517

Let me know if you’re using a custom Python install (e.g., compiled manually, via pyenv, conda, etc.), and I can give more specific guidance.

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