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Add lz4 dependency to the build instructions

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At build-time of exosphere, the `split_program.py` script is called.
It requires python module `lz4` -> https://github.com/Atmosphere-NX/Atmosphere/blob/master/exosphere/program/split_program.py

Adding lz4 to the building.md documentation.
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tuxuser 2020-12-30 10:31:31 +01:00 • committed by GitHub
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docs/building.md
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@ -5,7 +5,8 @@ Building Atmosphère is a very straightforward process that relies almost exclus
+ [devkitA64](https://devkitpro.org)
+ [devkitARM](https://devkitpro.org)
+ [Python 2](https://www.python.org) (Python 3 may work as well, but this is not guaranteed)
+ [PyCryptodome](https://pypi.org/project/pycryptodome) (optional)
+ [LZ4 (Python library)](https://pypi.org/project/lz4)
+ [PyCryptodome (Python library)](https://pypi.org/project/pycryptodome) (optional)
## Instructions
1. Follow the guide located [here](https://devkitpro.org/wiki/Getting_Started) to install and configure all the tools necessary for the build process.
@ -17,12 +18,15 @@ Building Atmosphère is a very straightforward process that relies almost exclus
+ `devkitARM`
+ `devkitarm-rules`
3. (Optional) In order to build [sept](components/sept.md) the pycryptodome PyPi package is required, which can be installed by running `pip install pycryptodome` under the installed Python environment of your choice or by installing the complete zip package to support the `make dist` recipe. This is an optional step included for advanced users who have the ability to provide the necessary encryption/signing keys themselves.
3. Install the following library via python's package manager `pip`, required by [exosphere](components/exosphere.md):
+ `lz4`
4. It is, instead, possible to build [sept](components/sept.md) by providing previously encrypted/signed binaries distributed by official Atmosphère release packages. In order to do so, export the following variables in your current environment:
4. (Optional) In order to build [sept](components/sept.md) the pycryptodome PyPi package is required, which can be installed by running `pip install pycryptodome` under the installed Python environment of your choice or by installing the complete zip package to support the `make dist` recipe. This is an optional step included for advanced users who have the ability to provide the necessary encryption/signing keys themselves.
5. It is, instead, possible to build [sept](components/sept.md) by providing previously encrypted/signed binaries distributed by official Atmosphère release packages. In order to do so, export the following variables in your current environment:
+ `SEPT_00_ENC_PATH` (must point to the `sept-secondary_00.enc` file)
+ `SEPT_01_ENC_PATH` (must point to the `sept-secondary_01.enc` file)
+ `SEPT_DEV_00_ENC_PATH` (must point to the `sept-secondary_dev_00.enc` file)
+ `SEPT_DEV_01_ENC_PATH` (must point to the `sept-secondary_dev_01.enc` file)
5. Finally, clone the Atmosphère repository and run `make` under its root directory.
6. Finally, clone the Atmosphère repository and run `make` under its root directory.