NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST gdb-6.8 i686-linux /nix/store/xsk397a30grd7pxnxp5lmspc3rmv0cn3-gdb-6.8.drv /nix/store/jzndj2yfq9jxim5vwmslxg5kmzcaxs0n-gdb-6.8