anchor.diff:    NIX_CFLAGS_LINK = [ "-lsystemd" ] ++ lib.concatMap (x: x.NIX_CFLAGS_LINK or []) needed;
   
     meta = with stdenv.lib; {
  -    homepage = http://uwsgi-docs.readthedocs.org/en/latest/;
  +    homepage = https://uwsgi-docs.readthedocs.org/en/latest/;
       description = "A fast, self-healing and developer/sysadmin-friendly application container server coded in pure C";
       license = licenses.gpl2;
       maintainers = with maintainers; [ abbradar schneefux ];
  
positive.code: 
    nativeBuildInputs = [ python3 pkgconfig ];
  
    buildInputs =  [ jansson ]
                ++ lib.optional withPAM pam
                ++ lib.optional withSystemd systemd
                ++ lib.concatMap (x: x.inputs) needed
  
negative.code: { stdenv, lib, fetchurl, pkgconfig, jansson, pcre
  # plugins: list of strings, eg. [ "python2" "python3" ]
  , plugins
  , pam, withPAM ? false
  