Change 'ensure-directories-exist' to look for 'mkdir' in $PATH, not in /bin.

--- maxima-5.36.1/lisp-utils/defsystem.lisp.orig	2014-11-22 16:21:30.000000000 -0500
+++ maxima-5.36.1/lisp-utils/defsystem.lisp	2015-05-25 21:53:31.223648483 -0400
@@ -4627,7 +4627,7 @@
         (cmd (if (member :win32 *features*)
                  (format nil "mkdir \"~a\""
                          (coerce (subst #\\ #\/ (coerce (namestring dir) 'list)) 'string))
-                 (format nil "/bin/mkdir -p ~S" (namestring dir)))))
+                 (format nil "mkdir -p ~S" (namestring dir)))))
    (unless (directory dir)
      (lisp:system cmd))
    ;; The second return value is supposed to be T if directories were
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<tr><td><span title='2019-04-28 22:57:07 +0200'>2019-04-28</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=43c1c44a1194579cd9e0149e41886762d9efc9dc'>installer: User can have a "real name".</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/user.scm (&lt;user&gt;)[real-name]: New field.
(users-&gt;configuration)[use-&gt;sexp]: Turn it into a 'comment' field.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 00:45:35 +0200'>2019-04-25</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=91a7c4998fe4f5a2a63f2ddb4bfeeef81c68b6d7'>installer: Ask for the root account password.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/35399&gt;.

* gnu/installer/newt/user.scm (run-root-password-page): New procedure.
* gnu/installer/user.scm (users-&gt;configuration): Filter out the "root"
account.
* gnu/installer/final.scm (create-user-database): Set 'uid' field in
'user-account' form.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 00:45:34 +0200'>2019-04-25</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=898677ed17672130d20434cd88575d620c97c553'>installer: Ask for user password and initialize /etc/shadow.</a><span class='msg-avail'>...<span class='msg-tooltip'>Partly fixes &lt;https://bugs.gnu.org/35399&gt;.

* gnu/installer/user.scm (&lt;user&gt;)[password]: New field.
* gnu/installer/final.scm (%seed): New variable.
(integer-&gt;alphanumeric-char, random-string)
(create-user-database): New procedures.
(install-system): Call 'create-user-database'.
* gnu/installer/newt/final.scm (run-install-shell): Add #:users and pass
it to 'install-system'.
(run-final-page): Pass #:users to 'run-install-shell'.
* gnu/installer/newt/user.scm (run-user-add-page): Add password entry.
Pass its result as the 'password' field of &lt;user&gt;.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-17 14:04:24 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=47c94801656c7e9ddf1dcfe0189b48d7c57d0a1d'>installer: Add user module.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/user.scm: New file.
</span></span></td><td>Mathieu Othacehe</td></tr>