let # Pin the nixpkgs version stdenv = pkgs.stdenv; pkgsOriginal = import {}; pkgsSrc = pkgsOriginal.fetchzip { url = "https://github.com/NixOS/nixpkgs/archive/18.03.zip"; sha256 = "0hk4y2vkgm1qadpsm4b0q1vxq889jhxzjx3ragybrlwwg54mzp4f"; }; pkgs = import (pkgsSrc) {}; buildNodeJS = pkgs.callPackage {}; in rec { nodeFromNVMRC = buildNodeJS { version = "8.7.0"; sha256 = "16mml3cwjnq7yf9yd67d2dybav3nvbnk89fkixs1wz7fd26d05ss"; patches = []; }; }