Installing the Compilation Tools

For details about the functions of the OpenHarmony compilation and building module, see Compilation and Building Guide.

Perform the following steps on Ubuntu.

hb Installation

NOTE

For details about how to install the proxy, see Configuring the Proxy.

Run the following command to install hb and update it to the latest version:
```
python3 -m pip install --user build/hb
```
Set an environment variable.
```
vim ~/.bashrc
```
Copy the following command to the last line of the .bashrc file, save the file, and exit.
```
export PATH=~/.local/bin:$PATH
```
Update the environment variable.
```
source ~/.bashrc
```
Run the hb help command in the source code directory. If the following information is displayed, the installation is successful:

NOTICE
To uninstall hb, run the following command:
python3 -m pip uninstall ohos-build   
If any issue occurs during the hb installation, see FAQs.

Installing LLVM (Only Required for OpenHarmony_v1.x)

NOTICE

When downloading source code under the OpenHarmony_v1.x branches or tags, perform the procedure described in this section to install LLVM 9.0.0.

When downloading source code under the Master or non-OpenHarmony_v1.x branches or tags, skip this section. hb will automatically download the latest version of LLVM.

Start the Linux server.
Download LLVM.
Decompress the LLVM installation package to ~/llvm.
```
tar -zxvf llvm.tar -C ~/
```
Set an environment variable.
```
vim ~/.bashrc
```
Copy the following command to the last line of the .bashrc file, save the file, and exit.
```
export PATH=~/llvm/bin:$PATH
```
Validate the environment variable.
```
source ~/.bashrc
```