/usr/share/automake-1.4/mkinstalldirs is in automake1.4 1:1.4-p6-13.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40  | #! /bin/sh
# mkinstalldirs --- make directory hierarchy
# Author: Noah Friedman <friedman@prep.ai.mit.edu>
# Created: 1993-05-16
# Public domain
# $Id: mkinstalldirs,v 1.13 1999/01/05 03:18:55 bje Exp $
errstatus=0
for file
do
   set fnord `echo ":$file" | sed -ne 's/^:\//#/;s/^://;s/\// /g;s/^#/\//;p'`
   shift
   pathcomp=
   for d
   do
     pathcomp="$pathcomp$d"
     case "$pathcomp" in
       -* ) pathcomp=./$pathcomp ;;
     esac
     if test ! -d "$pathcomp"; then
        echo "mkdir $pathcomp"
        mkdir "$pathcomp" || lasterr=$?
        if test ! -d "$pathcomp"; then
  	  errstatus=$lasterr
        fi
     fi
     pathcomp="$pathcomp/"
   done
done
exit $errstatus
# mkinstalldirs ends here
 |