于是我根据前两个问题想出了一个答案:

So I figured out an answer according to these two previous questions:

• 执行时出错 -version `Qt_5' not发现需要
• 如何设置环境变量LD_LIBRARY_PATH在Linux中

总而言之，要以正确的方式添加库，应将自定义 .conf 文件添加到文件夹 /etc/ld.so.conf.d 中，其中包含库文件夹的所有绝对路径，然后运行 ​​sudo ldconfig.:)

To summarize, to add the libraries the right way, one should add a custom .conf file to the folder /etc/ld.so.conf.d containing all the absolute paths to library folders and then run sudo ldconfig. :)