安装 pyvirtualcam 失败 提示 No matching distribution found for pyvirtualcampyvirtualcam

想要安装 pyvirtualcam，pip install pyvirtualcam 一直失败，提示：

ERROR: Could not find a version that satisfies the requirement pyvirtualcam (from versions: none)
ERROR: No matching distribution found for pyvirtualcam

尝试过在机器上安装了 OBS 之后再 pip install，也不断地切换 pip 源，官方的、清华阿里中科大豆瓣都试了全都是一样的提示。

最后只好去 https://github.com/letmaik/pyvirtualcam 下载源码构建了

git clone https://github.com/letmaik/pyvirtualcam --recursive
cd pyvirtualcam
pip install .

按照这个步骤做了之后，安装成功。