NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST valgrind-3.4.1 i686-linux /nix/store/34wy2pkbmb2rh4m47vbnrf9cnr26p93q-valgrind-3.4.1.drv /nix/store/hnwadv07vz0nylaq6mnx2kx38jcvgszz-valgrind-3.4.1