Preparations

Install the CANN development kit of the ARM version on Ubuntu 18.04 x86_64. For details, see Installing the CANN Development Kit.
Install the SDK of the ARM version on Ubuntu 18.04 x86_64. For details, see Installing MindX SDK.
Run the following command to install the cross compilation toolchain:
```
sudo apt-get install g++-aarch64-linux-gnu
```

Download and compile the zlib source code.
1. Download the zlib .gz package.
2. Decompress and compile the zlib source code.
```
tar zxvf zlib-1.2.11.tar.gz
```
  Copy the build_zlib.sh script to the same directory and run the following command to compile the script. For details about the build_zlib.sh script, see build_zlib Script Code.
```
bash build_zlib.sh
```
3. After the compilation is complete, copy the generated files to opensource in the SDK installation directory.
```
cp -r tmp/zlib/* ${MX_SDK_HOME}/opensource
ll ${MX_SDK_HOME}/opensource/lib
```

Parent topic: Cross Compilation Description