--- a/build-aux/install-sh	Sun Mar 11 14:42:07 2018 -0700
+++ b/build-aux/install-sh	Sun Mar 11 19:01:28 2018 -0700
@@ -1,7 +1,7 @@
 #!/bin/sh
 # install - install a program, script, or datafile
 
-scriptversion=2018-03-07.03; # UTC
+scriptversion=2018-03-11.20; # UTC
 
 # This originates from X11R5 (mit/util/scripts/install.sh), which was
 # later released in X11R6 (xc/config/util/install.sh) with the
@@ -332,34 +332,43 @@
             # is incompatible with FreeBSD 'install' when (umask & 300) != 0.
             ;;
           *)
+            # Note that $RANDOM variable is not portable (e.g. dash);  Use it
+            # here however when possible just to lower collision chance.
             tmpdir=${TMPDIR-/tmp}/ins$RANDOM-$$
-            trap 'ret=$?; rmdir "$tmpdir/d" "$tmpdir" 2>/dev/null; exit $ret' 0
+
+            trap 'ret=$?; rmdir "$tmpdir/a/b" "$tmpdir/a" "$tmpdir" 2>/dev/null; exit $ret' 0
 
+            # Because "mkdir -p" follows existing symlinks and we likely work
+            # directly in world-writeable /tmp, make sure that the '$tmpdir'
+            # directory is successfully created first before we actually test
+            # 'mkdir -p' feature.
             if (umask $mkdir_umask &&
-                exec $mkdirprog $mkdir_mode -p -- "$tmpdir/d") >/dev/null 2>&1
+                $mkdirprog $mkdir_mode "$tmpdir" &&
+                exec $mkdirprog $mkdir_mode -p -- "$tmpdir/a/b") >/dev/null 2>&1
             then
               if test -z "$dir_arg" || {
                    # Check for POSIX incompatibilities with -m.
                    # HP-UX 11.23 and IRIX 6.5 mkdir -m -p sets group- or
                    # other-writable bit of parent directory when it shouldn't.
                    # FreeBSD 6.1 mkdir -m -p sets mode of existing directory.
-                   ls_ld_tmpdir=`ls -ld "$tmpdir"`
+                   test_tmpdir="$tmpdir/a"
+                   ls_ld_tmpdir=`ls -ld "$test_tmpdir"`
                    case $ls_ld_tmpdir in
                      d????-?r-*) different_mode=700;;
                      d????-?--*) different_mode=755;;
                      *) false;;
                    esac &&
-                   $mkdirprog -m$different_mode -p -- "$tmpdir" && {
-                     ls_ld_tmpdir_1=`ls -ld "$tmpdir"`
+                   $mkdirprog -m$different_mode -p -- "$test_tmpdir" && {
+                     ls_ld_tmpdir_1=`ls -ld "$test_tmpdir"`
                      test "$ls_ld_tmpdir" = "$ls_ld_tmpdir_1"
                    }
                  }
               then posix_mkdir=:
               fi
-              rmdir "$tmpdir/d" "$tmpdir"
+              rmdir "$tmpdir/a/b" "$tmpdir/a" "$tmpdir"
             else
               # Remove any dirs left behind by ancient mkdir implementations.
-              rmdir ./$mkdir_mode ./-p ./-- 2>/dev/null
+              rmdir ./$mkdir_mode ./-p ./-- "$tmpdir" 2>/dev/null
             fi
             trap '' 0;;
         esac;;

--- a/doc/maintain.texi	Sun Mar 11 14:42:07 2018 -0700
+++ b/doc/maintain.texi	Sun Mar 11 19:01:28 2018 -0700
@@ -5,7 +5,7 @@
 @c For double-sided printing, uncomment:
 @c @setchapternewpage odd
 @c This date is automagically updated when you save this file:
-@set lastupdate November 7, 2017
+@set lastupdate March 7, 2018
 @c %**end of header
 
 @dircategory GNU organization
@@ -2789,7 +2789,7 @@
 @bye
 
 Local variables:
-eval: (add-hook 'write-file-hooks 'time-stamp)
+eval: (add-hook 'before-save-hook 'time-stamp)
 time-stamp-start: "@set lastupdate "
 time-stamp-start: "@set lastupdate "
 time-stamp-end: "$"