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# Add GCC for node-canvas in Centos7.x

Node环境做canvas绘画时，依赖CXXABI\_1.3.9，但目前有一些centOS7的环境本身并不带此依赖。 在常规服务器上，我们只需要手动安装即可。但如果是通过ci/cd做镜像部署的时候，需要在项目中添加postinstall来实现。

#### 问题描述: <a href="#wen-ti-miao-shu" id="wen-ti-miao-shu"></a>

```bash
Error: /lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found
```

centos7.x 缺少 CXXABI\_1.3.9

<br>

#### 解决方案： <a href="#jie-jue-fang-an" id="jie-jue-fang-an"></a>

1. package依赖canvas版本在2.8以上
2. 新增npm script：

   ```json
   "postinstall": "yum install -y gcc-c++ cairo-devel libjpeg-turbo-devel pango-devel giflib-devel librsvg2-devel build && npm rebuild canvas --build-from-source"
   ```
3. 项目 script 文件夹下新增 `image_hook.sh`:

   ```bash
   yum install -y cairo-devel libjpeg-turbo-devel pango-devel giflib-devel librsvg2-devel
   ```

<br>

#### TODO <a href="#todo" id="todo"></a>

另外这里还有一个问题，由于yum本身在 `Windows/Mac` 并不存在，因此在postinstall时需要考虑判断操作系统。

<br>

#### 相关问题 <a href="#xiang-guan-wen-ti" id="xiang-guan-wen-ti"></a>

[Cannot get canvas running on CentOS 7](https://github.com/Automattic/node-canvas/issues/1796)