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diff --git a/indexing/xindex/latex/xindex.sty b/indexing/xindex/latex/xindex.sty
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+%% This is file `xindex.sty',
+%%
+%% Copyright (C) 2019-
+%% Herbert Voss
+%%
+%% It may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.3c
+%% of this license or (at your option) any later version.
+%% The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.3c or later is part of all distributions of LaTeX
+%% version 2005/12/01 or later.
+%
+% $Id: xindex.sty 836 2018-11-11 20:22:56Z herbert $
+%
+% -------------------------------------
+\ProvidesPackage{xindex}[2018/11/11 v. 0.02 write into an idx file (hv)]
+%
+\RequirePackage{xkeyval}
+
+\newif\if@@imakeidx \@@imakeidxfalse
+
+\DeclareOptionX{imakeidx}{\@@imakeidxtrue}
+\DeclareOptionX*{\PassOptionsToPackage\CurrentOption{imakeidx}}
+\ProcessOptionsX\relax
+
+\@ifpackageloaded{imakeidx}{}{%   imakeidx already loaded?? if not then define ...
+  \newif\ifimki@startedidx
+  \newif\ifimki@splitindex
+}
+
+\if@@imakeidx
+  \typeout{xindex: Using package imakeidx}%
+  \RequirePackage{imakeidx}
+  \def\imki@progdefault{xindex}
+  \def\imki@program{xindex}
+%
+  \def\imki@@startidxsplit#1{%
+    \if@filesw
+      \def\index{\@bsphack
+        \@ifnextchar [{\@index}{\@index[\imki@jobname]}}
+      \expandafter\newwrite\csname #1@idxfile\endcsname
+      \immediate\openout \csname #1@idxfile\endcsname #1.idx\relax
+      \def\writeidx##1{\write\expandafter\csname #1@idxfile\endcsname{\noexpand##1}}%
+      \typeout{Writing index file #1.idx}%
+    \fi
+  }
+  \global\imki@startedidxfalse
+  \def\imki@@startidxunique#1{%
+    \if@filesw
+      \ifimki@startedidx\else
+        \newwrite\@indexfile
+        \immediate\openout\@indexfile\imki@jobname.idx%
+        \def\writeidx##1{\write\@indexfile{\noexpand##1}}%
+        \global\imki@startedidxtrue
+      \fi
+      \def\index{\@bsphack
+        \@ifnextchar [{\@index}{\@index[\imki@jobname]}}
+      \expandafter\let\csname #1@idxfile\endcsname\@empty
+      \typeout{Started index file #1}%
+   \fi
+  }
+%
+  \ifimki@splitindex
+    \let\imki@startidx\imki@@startidxunique
+  \else
+    \let\imki@startidx\imki@@startidxsplit
+  \fi
+\else
+  \typeout{xindex: Using package makeidx}%
+  \RequirePackage{makeidx}
+  \def\writeidx#1{\write\@indexfile{\noexpand#1}}
+\fi
+
+\endinput
+