anchor.diff:  { stdenv, fetchurl, pkgconfig, attr, acl, zlib, libuuid, e2fsprogs, lzo
  -, asciidoc, xmlto, docbook_xml_dtd_45, docbook_xsl, libxslt }:
  +, asciidoc, xmlto, docbook_xml_dtd_45, docbook_xsl, libxslt
  +}:
   
   let version = "4.1.1"; in
   
  -stdenv.mkDerivation (rec {
  +stdenv.mkDerivation rec {
     name = "btrfs-progs-${version}";
   
     src = fetchurl {
  
positive.code:     asciidoc xmlto docbook_xml_dtd_45 docbook_xsl libxslt
    ];
  
    # for btrfs to get the rpath to libgcc_s, needed for pthread_cancel to work
    NIX_CFLAGS_LINK = "-lgcc_s";
  
    makeFlags = "prefix=$(out)";
  
    meta = with stdenv.lib; {
      description = "Utilities for the btrfs filesystem";
  
negative.code:     maintainers = with maintainers; [ raskin wkennington ];
      platforms = platforms.linux;
    };
  }
  