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在学习linux系统C++网络开发时，boost库的安装花费了我不少时间。在此将我的经历记录下来，方便学习交流。
在学习linux开发的过程中，Centos与Ubuntu两个系统我都有使用。两个系统都有各自的软件安装器：Centos为yum，而Ubuntu为apt-get。就我个人而言，在使用感觉上，yum要稍好于apt-get。
在软件安装时，最好使用系统自带的安装器。安装器会在软件安装时自动处理好相关依赖，若自行手动安装，不仅要学会自行处理复杂的依赖，不同时期的软件依赖还有可能发生变化，极有可能安装失败。
说回boost库的安装，在Centos与Ubuntu自带的软件源中都包含boost库，直接安装即可：
Centos：
yum install boost yum install boost-devel yum install boost-doc
Ubuntu:
apt-cache search boost sudo apt-get install libboost-all-dev
C++在编译时若需要使用boost库记得使用 -lboost_system
Centos在安装完成后即可直接使用，Ubuntu在编译时会提示找不到boost库，即便我将boost手动加入了系统路径，也没有解决问题。最终只有Centos成功安装。
如果有明白解决方法的大佬欢迎留言。
<>gcc的升级
在Centos完成安装后，我试着去编译写好的C++文件，发现auto类型无法识别。查看自带的gcc版本为4.8，太过老旧，没有完全支持C++11标准。
我使用的是Centos7系统，Centos7为了保证系统稳定，软件都采用了较低版本，而且自带软件源中没有新版本可供更新。
最终我手动添加了新的外部软件源，安装了新版本的gcc，并且写了一个脚本，在打开终端时自动将新版本gcc作为默认编译。
