anchor.diff:      sha256 = "1rj8vy6hq140pbnc7mjjb34mfqdgdah1dmlv2073izdgakh7p38j";
     };
   
  -  buildInputs = [ autoconf automake boost pkgconfig libtool acl libxml2 btrfs-progs dbus_libs docbook_xsl libxslt docbook_xml_dtd_45 diffutils pam utillinux attr gettext ];
  +  buildInputs = [
  +    acl attr boost btrfs-progs dbus_libs pam utillinux
  +  ];
  +  nativeBuildInputs = [
  +    autoreconfHook diffutils pkgconfig
  +    docbook_xsl libxml2 libxslt docbook_xml_dtd_45
  +  ];
   
     patchPhase = ''
       # work around missing btrfs/version.h; otherwise, use "-DHAVE_BTRFS_VERSION_H"
  
positive.code: { stdenv, fetchFromGitHub, autoconf, automake, boost, pkgconfig, libtool, acl, libxml2, btrfs-progs, dbus_libs, docbook_xsl, libxslt, docbook_xml_dtd_45,  diffutils, pam, utillinux, attr, gettext }:
  
  stdenv.mkDerivation rec {
    name = "snapper-${ver}";
  
negative.code:     '';
  
    configurePhase = ''
      ./configure --disable-silent-rules --disable-ext4 --disable-btrfs-quota --prefix=$out
      '';
  
  