特定版本软件

No way to install/use a specific package version? (opens new window)

There isn't a clear canonical way to refer to a specific package version (opens new window)

参考文章 Searching and installing old versions of Nix packages (opens new window)

https://lazamar.co.uk/nix-versions/

qt gcc

Nixpkgs Architecture Team 提到了这个问题 (opens new window)，希望未来会有更好的解决方案。