Resolving the ImportError: Cython not found! in Buildroot

Struggling with Buildroot and getting the `ImportError: Cython not found!` message while trying to build hdbscan? Discover how to resolve this issue with our step-by-step guide!
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This video is based on the question https://stackoverflow.com/q/69633691/ asked by the user 'Lalastro' ( https://stackoverflow.com/u/16742448/ ) and on the answer https://stackoverflow.com/a/70301558/ provided by the user 'Arnout' ( https://stackoverflow.com/u/957841/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the ImportError: Cython not found! in Buildroot: A Simple Guide

If you've encountered the error message ImportError: Cython not found! while attempting to run a full make command in Buildroot, you're not alone. Many developers have faced this frustrating issue, particularly when integrating Python packages like hdbscan. This guide will guide you through understanding the problem and implementing a solution effectively.

Understanding the Problem

When you try to build the hdbscan package in Buildroot, it may require Cython as a dependency. The error you are seeing suggests that even though Cython appears to be installed on your system, Buildroot is unable to locate it. The relevant part of the error message indicates that the setup process for hdbscan cannot find Cython:

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This problem may stem from the fact that Cython needs to be part of the cross-compilation environment that Buildroot uses, rather than simply being installed on your host machine.

Proposed Solutions

1. Add Cython as a Dependency in Buildroot

The first step in resolving this issue is to explicitly specify Cython as a dependency for the hdbscan package within Buildroot. To do this, follow these steps:

Edit python-hdbscan.mk File

You need to add the following line to the python-hdbscan.mk file, which is located within your Buildroot package directory:

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This line tells Buildroot that hdbscan requires Cython as part of its building process.

2. Update Config.in File

In addition to modifying the python-hdbscan.mk file, you must also ensure that the corresponding dependency is included in the Buildroot configuration. This is done in the Config.in file. Add this snippet to the appropriate section of your Config.in file:

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This ensures that when you configure your Buildroot environment, Cython will be selected as a required package for hdbscan to build successfully.

Final Steps

3. Rebuild Your Project

Once you have completed the modifications mentioned above, save the files and return to your Buildroot environment. Run the make command again. This should initiate the build process while now including Cython as a dependency, resolving the ImportError you previously encountered.

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Conclusion

Encountering errors like ImportError: Cython not found! when working with Buildroot can be daunting. However, by understanding the problem and taking the proper steps to add Cython as a dependency, you can successfully build Python packages like hdbscan without a hitch.

If you still face issues after following this guide, please reach out for further assistance. Happy coding, and good luck with your Buildroot project!

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