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='2018-05-20 21:42:33 +0300'>2018-05-20</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=6a2b906565b677d62210d69d418ce150c202931b'>services: dbus: Search more directories for '.service' files.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-07-11 00:48:51 +0200'>2017-07-11</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=3e8d037b168f101aa4691f0f963e6084e0f37df7'>services: dbus, polkit: Add default value.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-11-24 21:43:47 +0100'>2016-11-24</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=2e328698248b4b5d7ed07af89796acd9bfadbaff'>services: Move polkit to (gnu services dbus).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-09-10 13:10:06 +0200'>2016-09-10</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=9e41130b14ad32c4e1fa756f95d806703056cb60'>system: Use 'file-append' to denote file names.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-07-21 18:53:27 +0200'>2016-07-21</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=24e964314ecfd29b8c592bfb7be923e8f740574c'>services: Export *-service-type and *-configuration.</a><span class='msg-avail'>...</span></td><td>Tomáš Čech</td></tr>
<tr><td><span title='2016-07-16 14:41:39 +0200'>2016-07-16</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=b9bb50c608447170891af524a614748210deea89'>services: dbus: Synchronize startup using dbus-daemon's PID file.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-07-12 22:47:08 +0200'>2016-07-12</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=4ee96a7912eef8c41c855c680f924dcdba2d9c97'>gnu: Switch to 'with-imported-modules'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-03-09 15:31:23 +0100'>2016-03-09</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=f5a9103991531d17bd1d5a944dcec1c49fb9f395'>gnu: dbus: Incorporate "dbus-helper-search-path.patch".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-01-29 20:21:53 +0300'>2016-01-29</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=d4053c710bc2c7a4f624ba2d72438d8f289ad569'>services: Rename 'dmd' services to 'shepherd'.</a><span class='msg-avail'>...</span></td><td>Alex Kost</td></tr>
<tr><td><span title='2016-01-29 20:21:53 +0300'>2016-01-29</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=0190c1c02fd8cefa9642add58b4c7ccf75f082a7'>Rename (gnu services dmd) to (gnu services shepherd).</a><span class='msg-avail'>...</span></td><td>Alex Kost</td></tr>
<tr><td><span title='2015-10-22 00:41:09 +0200'>2015-10-22</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=cde0402169cd93497084664c8d8d399808a1ea82'>services: dbus: Support service activation.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-10-21 23:37:02 +0200'>2015-10-21</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=4a663ca4e8b5ded9a3d92870fba8f2ebde22d75a'>services: dbus: Honor the config's dbus package.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-10-19 19:25:15 +0800'>2015-10-19</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=64643b90ab490eef34226c2f01de9f782de7333f'>services: dbus: Build '/etc/dbus-1/system-local.conf'.</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>
<tr><td><span title='2015-10-10 22:55:15 +0200'>2015-10-10</span></td><td><a href='/guix/commit/gnu/services/dbus.scm?id=0adfe95a3eee335847c3127edde3de550e692440'>services: Introduce extensible services.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>