anchor.diff:      curl
       libpcap
       linux-headers
  -    openssl_1-0-2
  +    openssl
       pam
       stdenv.cc.libc
     ];
  
positive.code:     sed -i pppd/plugins/pppoatm/Makefile.linux \
        -i pppd/plugins/rp-pppoe/Makefile.linux \
        -e 's/-m 4550/-m 550/'
    '';
  
    preBuild = ''
      # Prevent build from creating sbin/
      makeFlagsArray+=("BINDIR=$out/bin")
    '';
  
    NIX_LDFLAGS = [
      "-L${stdenv.cc.libc}/lib -lcrypt"
    ];
  
    makeFlags = [
      /* Microsoft callback control protocol */
  
negative.code: , curl
  , libpcap
  , linux-headers
  , openssl
  , pam
  }:
  
  