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9 changes: 5 additions & 4 deletions docs/site_specific_config/host_injections.md
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## Why configuration is necessary

Just [installing EESSI](../getting_access/native_installation.md) is enough to get started with the EESSI software stack on a CPU-based system. However, additional configuration is necessary in many other cases, such as
- enabling GPU support on GPU-based systems
- site-specific configuration / tuning of the MPI libraries provided by EESSI
- overriding EESSI's MPI library with an ABI compatible host MPI
Just [installing EESSI](../getting_access/native_installation.md) is enough to get started with the EESSI software stack on a CPU-based system. However, additional configuration is necessary in other cases such as:

- enabling GPU support on GPU-based systems,
- site-specific configuration / tuning of the MPI libraries provided by EESSI,
- overriding EESSI's MPI library with an ABI compatible host MPI.

## The `host_injections` variant symlink

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