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