NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST pkg-config-0.22 x86_64-linux /nix/store/44xk5cvl8my3w46jp5lb6g42mfilzqa3-pkg-config-0.22.drv /nix/store/0if64djzkfnk1hyy96b4lcgnj5cdy7sl-pkg-config-0.22