Packging 101 
WIP work in progress
TODO
1. stdenv 
TODO
2. language specific frameworks 
TODO
References 
- NixOS 系列(三):软件打包,从入门到放弃 - LanTian
 - How to Learn Nix, Part 28: The standard environment
 - stdenv - Nixpkgs Manual
 - languages-frameworks - Nixpkgs Manual
 - Wrapping packages - NixOS Cookbook
 - Useful tools:
 - Source Code: 
- pkgs/build-support/trivial-builders/default.nix - runCommand
 - pkgs/build-support/setup-hooks/make-wrapper.sh
 - FHS related 
- pkgs/build-support/build-fhsenv-bubblewrap/buildFHSEnv.nix: 
pkgs.buildFHSEnvBubblewrap - pkgs/build-support/build-fhsenv-chroot/default.nix: 
pkgs.buildFHSEnvChroot 
 - pkgs/build-support/build-fhsenv-bubblewrap/buildFHSEnv.nix: