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='2020-12-13 00:35:50 +0100'>2020-12-13</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=9faee1e64585e99ff2a93fe65ed26a0a28c46ca1'>gnu: openntpd: Update to 6.8p1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (openntpd): Update to 6.8p1.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-10-13 23:48:15 +0200'>2020-10-13</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=9e1f5a263e4f6df4d075901c9b58a56f80c8b452'>gnu: libcap: Make 'libcap/next' the default libcap.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/avahi.scm (avahi)[inputs]: Refer to LIBCAP-2.31 instead of LIBCAP.
* gnu/packages/base.scm (coreutils)[inputs]: Likewise.
* gnu/packages/linux.scm (libcap): Rename to ...
(libcap-2.31): ... this.
(libcap/next): Rename to ...
(libcap): ... this.
(libcap/next): Define as deprecated alias for LIBCAP.
(fakeroot)[inputs]: Change from LIBCAP/NEXT to LIBCAP.
* gnu/packages/ntp.scm (chrony, ntp)[inputs]: Likewise.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-10-08 15:57:30 +0200'>2020-10-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=6072182b3d9debaa126a6e4a3ac45eab9c28e20c'>gnu: chrony: Support Network Time Security (NTS).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (chrony)[inputs]: Add gnutls.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-10-08 15:57:30 +0200'>2020-10-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=f73e09b2c812eb0c348f7605b49ce6d19ec8bb4a'>gnu: chrony: Update to 4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (chrony): Update to 4.0.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-09-13 15:46:02 -0400'>2020-09-13</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=898fbb60b2354e82e5b7f259b44dbfed112a83aa'>gnu: Fix a crash in NTP and Chrony.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/43321&gt;.

* gnu/packages/ntp.scm (ntp, chrony)[inputs]: Replace libcap with libcap/next.
</span></span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-08-20 12:53:06 +0200'>2020-08-20</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=2ca5b4858f52d15599b4b477a40579603a1b39f7'>gnu: chrony: Update to 3.5.1 [fixes CVE-2020-14367].</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (chrony): Update to 3.5.1.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-11 22:59:54 +0200'>2020-07-11</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=bc332f07173a277cdad17b30021dad0299a858f3'>gnu: ntp: Update to 4.2.8p15 [security fixes].</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (ntp): Update to 4.2.8p15.
[source]: Swap order of URIs.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-04-08 17:05:51 +0200'>2020-04-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=198571b264547f800803e554c8f21a9c95be959c'>gnu: openntpd: Don't use NAME in source URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (openntpd)[source]: Hard-code NAME.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-04-08 14:42:29 +0200'>2020-04-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=9f12e06bb3c84c148a28491a480c7b8f55a3c131'>gnu: Add chrony.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ntp.scm (chrony): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-03-31 14:30:39 +0200'>2020-03-31</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=4b163550bda509c8e3c4c917d8e836cd876f9d72'>gnu: Order module imports in (gnu packages ntp).</a><span class='msg-avail'>...<span class='msg-tooltip'>This shouldn't cause any conflicts :-)

* gnu/packages/ntp.scm: Order module imports alphabetically.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>