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When you try to install the pykerberos package, you might encounter an error like this: 
Running setup.py install for pykerberos ... error
  error: subprocess-exited-with-error

  × Running setup.py install for pykerberos did not run successfully.
  │ exit code: 1
  ╰─> [16 lines of output]
      running install
      running build
      running build_ext
      building 'kerberos' extension
      ...
      src/kerberos.c:18:10: fatal error: Python.h: No such file or directory
         18 | #include <Python.h>
                       ^~~~~~~~~~
      compilation terminated.
      error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> pykerberos

​
Root Cause

The pykerberos package compiles a C extension during installation. The error fatal error: Python.h: No such file or directory means the Python development headers are missing. This is a common issue on Linux when the Python development package is not installed.

​
Resolution

Install the missing Python development headers and Kerberos development libraries: 
sudo apt-get update
sudo apt-get install -y python3-dev python3.10-dev libkrb5-dev libgssapi-krb5-2 krb5-config build-essential
Replace python3.10-dev with the version matching your Python installation (e.g., python3.11-dev).

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