anchor.diff:    optOpenldap = if libOnly then null else shouldUsePkg openldap;
     optPython = shouldUsePkg python;
     optGo = shouldUsePkg go;
  -  optKrb5 = if libOnly then null else shouldUsePkg krb5;
  +  optLibkrb5 = if libOnly then null else shouldUsePkg libkrb5;
     optTcp_wrappers = if libOnly then null else shouldUsePkg tcp_wrappers;
   in
   with stdenv.lib;
  
positive.code:     (mkWith   (optPython != null)       "python"      null)
      (mkWith   (optGo != null)           "golang"      null)
      (mkEnable (!libOnly)                "listener"    null)
      (mkEnable (optKrb5 != null)         "gssapi-krb5" null)
      (mkEnable false                     "systemd"     null)
      (mkWith   false                     "debug"       null)
      (mkWith   false                     "warn"        null)
  
negative.code: , libcap_ng
  
  # Optional Dependencies
  , openldap ? null, python ? null, go ? null, libkrb5 ? null, tcp_wrappers ? null
  
  # Extra arguments
  , prefix ? ""
  