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