anchor.diff:    '';
   
     NIX_LDFLAGS = [
  -    "-L${stdenv.libc}/lib -lcrypt"
  +    "-L${stdenv.cc.libc}/lib -lcrypt"
     ];
   
     makeFlags = [
  
positive.code:     (substituteAll {
        src = ./nix-purity.patch;
        inherit libpcap;
        glibc = stdenv.libc;
      })
      # Gentoo patchset 2.4.7-2
      # https://dev.gentoo.org/~pinkbyte/distfiles/patches/
  
negative.code:     linux-headers
      openssl_1-0-2
      pam
      stdenv.cc.libc
    ];
  
    postUnpack = ''
  