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Fixed incorrect variable name in README #68

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Jul 17, 2025
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Fixed incorrect variable name in README #68

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9 changes: 8 additions & 1 deletion README.md
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Expand Up @@ -111,9 +111,16 @@ python pyorbit3_sns_linac_mebt_hebt2.py
## 5. MPI consideration
By default, the build system will try to find MPI and compile against it. You can control which MPI to use with command line option when building.
```bash
pip install --config-settings=setup-args="-DMPI_USE=none" .
pip install --config-settings=setup-args="-DUSE_MPI=none" .
```
Above will build PyORBIT without MPI even if MPI is present. You can change that option to `mpich`, `ompi`, `none` or `auto` (default).<br>
| MPI flavor | Installation command |
|---------------|--------------|
| No MPI | `pip install --config-settings=setup-args="-DUSE_MPI=none" .` |
| The first found MPI installation if any | `pip install --config-settings=setup-args="-DUSE_MPI=auto" .` |
| OpenMPI | `pip install --config-settings=setup-args="-DUSE_MPI=ompi" .` |
| MPICH | `pip install --config-settings=setup-args="-DUSE_MPI=mpich" .` |

Meson uses PKG_CONFIG to discover packages. It could be useful to help it to find your MPI installation:

```bash
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