NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST sylpheed-2.5.0 x86_64-linux /nix/store/alkxklra84svigbk6hdhz08slpnx2qjw-sylpheed-2.5.0.drv /nix/store/c6k9pfw4lks7rja8x64m9d3ys8w40kgl-sylpheed-2.5.0