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+$clean_ext .= " %R-*.ind %R-*.idx %R-*.ilg %R-*.ind";
+
+$makeindex = 'internal splitindex';
+
+sub splitindex {
+ # Use splitindex instead of makeindex.
+ # The splitindex programe starts from an .idx file, makes a set of
+ # other .idx files for separate indexes, and then runs makeindex to
+ # make corresponding .ind files.
+ # However, it is possible that the document uses the splitindex
+ # package, but in a way compatible with the standard methods
+ # compatible with makeindex, i.e., with a single index and with the
+ # use of the \printindex command.
+ # Then we need to invoke makeindex.
+ # In addition, latexmk assumes that makeindex or its replacement makes
+ # an .ind file from an .idx file, and latexmk gives an error if it
+ # doesn't exist, we need to make an .ind file.
+ # Both problems are solved by running makeindex and then splitindex.
+ # Note: errors are returned by makeindex and splitindex for things
+ # like a missing input file. No error is returned for lines in an
+ # input file that are in an incorrect format; they are simply
+ # ignored. So no problem is caused by lines in the .idx file
+ # that are generated by splitindex in a format incompatible with
+ # makeindex.
+ my $ret1 = system( "makeindex", $$Psource );
+ my $ret2 = system( "splitindex", $$Psource );
+ return $ret1 || $ret2;
+}
+