anchor.diff: -{ stdenv, lib, fetchurl, openssl, libtool, perl, libxml2
  +{ stdenv, lib, fetchurl
  +, perl
  +, libcap, libtool, libxml2, openssl
   , enablePython ? false, python3 ? null
   , enableSeccomp ? false, libseccomp ? null, buildPackages
   }:
  
positive.code:     "--without-idn"
      "--without-idnlib"
      "--without-lmdb"
      "--without-pkcs11"
      "--without-purify"
      "--with-randomdev=/dev/random"
  
negative.code: 
    configureFlags = [
      "--localstatedir=/var"
      "--with-libcap=${libcap.dev}"
      "--with-libtool"
      "--with-libxml2=${libxml2.dev}"
      "--with-openssl=${openssl.dev}"
  