This file is indexed.

/usr/share/xindy/styles/makeidx.xdy is in xindy-rules 2.4-1.3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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;; $Id: makeidx.xdy,v 1.1 1997/02/07 14:17:31 kehr Exp $
;;
;; This file implements the Output Style Specifiers for plain
;; makeindex (see manpage of makeindex 2.x) in conjuction with
;; TeX/LaTeX.
;;
;; The Input Style Specifiers of makeindex cannot de defined in a
;; `xindy' style file. Use an appropriate version of the program
;; `tex2xindy' which should be included with this distribution.
;;
;; Since `xindy' uses a different specification language than
;; makeindex and some of the command-line options of makeindex are now
;; only available as style-file commands, this file can only serve as
;; a template that produces the default-markup of makeindex. However,
;; it may be used as a starting point for further modification and
;; specialization.
;;
;; The following values are taken from the source of the makeindex
;; distribution (see file scanst.h and the manpage) for further
;; details.
;;

;; Define all attributes appearing in your document. Your attributes
;; are all encapsulators you use in your \index commands following the
;; vertical bar sign `|'. For example `foo' is the attribute in the
;; command \index{...|foo}. Here you specify the set of attributes
;; that appear in your document, the order in which they appear in the
;; index and which one superdes the other.
;;
;; Example: a) (define-attibutes (("default") ("bf") ("it")))
;;          b) (define-attibutes (("bf" "default")))
;;
;; The initial command is (change it accordingly):

(define-attributes ("default"))

;; The description of the location-classes.
;; Add more location classes as needed.

(define-location-class "arabic-page-numbers" ("arabic-numbers"))
(define-location-class "roman-page-numbers"  ("roman-numbers-lowercase"))
(define-location-class "Roman-page-numbers"  ("roman-numbers-uppercase"))
(define-location-class "alpha-page-numbers"  ("alpha"))
(define-location-class "Alpha-page-numbers"  ("ALPHA"))

;; The most frequently used cross reference class "see". Add more, if
;; necessary.

(define-crossref-class "see")
(markup-crossref-list :open "\see{" :close "}{}" :class "see")

;; In makeindex: page_precedence <string>  "rnaRA"
;; List all location classes appearing in your document.

(define-location-class-order ("roman-page-numbers"
			      "arabic-page-numbers"
			      "alpha-page-numbers"
			      "Roman-page-numbers"
			      "Alpha-page-numbers"
			      "see"))


;; preamble <string>        "\\begin{theindex}\n"
;; postamble <string>       "\n\n\\end{theindex}\n"

(markup-index :open  "\begin{theindex}~n"
	      :close "~n~n\end{theindex}~n"
	      :tree)

;; These specifiers are not directly supported via a command-line
;; switch as in makeindex. Add the appropriate markup-commands into
;; the preamble.

;; setpage_prefix <string>  "~n  \setcounter{page}{"
;; setpage_suffix <string>  "}~n"

;; group_skip <string>      "~n~n  \indexspace~n"

(markup-letter-group-list :sep "~n~n  \indexspace~n")

;; The indexentries (item_<..> specifiers)

(markup-indexentry :open "~n  \item "           :depth 0)
(markup-indexentry :open "~n    \subitem "      :depth 1)
(markup-indexentry :open "~n      \subsubitem " :depth 2)

;; Location-references

;; delim_0 <string>         ", "
;; delim_1 <string>         ", "
;; delim_2 <string>         ", "

(markup-locclass-list :open ", " :sep ", ")

;; delim_n <string>         ", "

(markup-locref-list   :sep ", ")

;; delim_r <string>         "--"

(markup-range :sep "--")

;; Here follow all letter-groups. The short-cut notation is used here.

(define-letter-groups
    ("a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m"
     "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"))

;;
;; The sort-rules map all letters to their lowercase counterpart.
;;

(sort-rule "A" "a")
(sort-rule "B" "b")
(sort-rule "C" "c")
(sort-rule "D" "d")
(sort-rule "E" "e")
(sort-rule "F" "f")
(sort-rule "G" "g")
(sort-rule "H" "h")
(sort-rule "I" "i")
(sort-rule "J" "j")
(sort-rule "K" "k")
(sort-rule "L" "l")
(sort-rule "M" "m")
(sort-rule "N" "n")
(sort-rule "O" "o")
(sort-rule "P" "p")
(sort-rule "Q" "q")
(sort-rule "R" "r")
(sort-rule "S" "s")
(sort-rule "T" "t")
(sort-rule "U" "u")
(sort-rule "V" "v")
(sort-rule "W" "w")
(sort-rule "X" "x")
(sort-rule "Y" "y")
(sort-rule "Z" "z")


;; That's all ;-)


;; End

;; Local Variables:
;; mode: lisp
;; End: