subprocess.CalledProcessError: Command 'gcc --version | head -n1' returned non-zero exit status 255.

This error message indicates that the subprocess module in Python encountered an error when trying to execute the command "gcc --version | head -n1".

The non-zero exit status 255 means that the command failed to execute properly, possibly due to a syntax error or missing dependencies.

To resolve this error, you can try the following steps:

1. Check that the "gcc" compiler is installed on your system and properly configured. You may need to install or update the compiler to ensure it is working correctly.

2. Verify that the command "gcc --version" works correctly when run from a command prompt outside of Python.

3. Check that your Python environment is set up correctly and that there are no conflicting dependencies or packages that could be causing issues.

4. Consider using a different command or subprocess module call to achieve the desired result, if possible.

If none of these steps resolve the error, you may need to seek further assistance from a technical expert or support team.