anchor.diff:        }
   
         # Install git-subtree.
  -      make -C contrib/subtree install ${stdenv.lib.optionalString withManual "install-doc"}
  +      make -C contrib/subtree install ${stdenv.lib.optionalString withManual "USE_ASCIIDOCTOR=1 install-doc"}
         rm -rf contrib/subtree
   
         # Install contrib stuff.
  
positive.code:   '';
  
    nativeBuildInputs = [ gettext perlPackages.perl ]
      ++ stdenv.lib.optionals withManual [ asciidoc texinfo xmlto docbook2x
           docbook_xsl docbook_xml_dtd_45 libxslt ];
    buildInputs = [curl openssl zlib expat cpio makeWrapper libiconv]
      ++ stdenv.lib.optionals perlSupport [ perlPackages.perl ]
      ++ stdenv.lib.optionals guiSupport [tcl tk]
  
negative.code: , curl, openssl, zlib, expat, perlPackages, python3, gettext, cpio
  , gnugrep, gnused, gawk, coreutils # needed at runtime by git-filter-branch etc
  , openssh, pcre2
  , asciidoctor, texinfo, xmlto, docbook2x, docbook_xsl, docbook_xsl_ns, docbook_xml_dtd_45
  , libxslt, tcl, tk, makeWrapper, libiconv
  , svnSupport, subversionClient, perlLibs, smtpPerlLibs
  , perlSupport ? true
  