Have configure.py modify internal variables depending on the --qml-plugindir
configure option.
diff -u PyQt-gpl-5.4.alt/configure.py PyQt-gpl-5.4/configure.py
--- PyQt-gpl-5.4.alt/configure.py	2015-01-25 17:27:50.000000000 +0100
+++ PyQt-gpl-5.4/configure.py	2015-01-25 17:56:41.000000000 +0100
@@ -904,6 +904,9 @@
         if opts.pyuicinterpreter is not None:
             self.pyuic_interpreter = opts.pyuicinterpreter
 
+        if opts.qmlplugindir is not None:
+            self.qml_plugin_dir = opts.qmlplugindir
+
         if opts.qsciapidir is not None:
             self.qsci_api_dir = opts.qsciapidir
 
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<tr><td><span title='2020-07-30 19:17:20 +0200'>2020-07-30</span></td><td><a href='/guix/commit/gnu/packages.scm?id=a127e52f601ee73f675d5d28eac2388bb1ad11b0'>packages: 'generate-package-cache' is deterministic.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-07-25 19:11:37 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu/packages.scm?id=d51bfe242fbe6f3f8f71d723e8fe0c7bbe711ba1'>Use 'formatted-message' instead of '&amp;message' where appropriate.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-17 14:22:07 +0100'>2020-01-17</span></td><td><a href='/guix/commit/gnu/packages.scm?id=886a76073e4654449f413831897ffde736a07c91'>packages: Prevent inlining of 'find-best-packages-by-name'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-06 16:31:54 +0100'>2020-01-06</span></td><td><a href='/guix/commit/gnu/packages.scm?id=6a7c4636d4dec47eefa03c95da5a1315bd0e0413'>Adjust module autoloads.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
6ecc2de91d8177ea6e15531'>gnu: papagayo: Declare a source file-name.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-10-24 07:54:43 +0200'>2017-10-24</span></td><td><a href='/guix/commit/gnu/packages/animation.scm?id=2809a355b6473d947db24a0d80b4d2e8c454d9d7'>gnu: Add papagayo.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-07-26 12:27:12 +0200'>2017-07-26</span></td><td><a href='/guix/commit/gnu/packages/animation.scm?id=d39238cf3d71abaacb57317499692217bf24235c'>gnu: synfig: Fix boost build error.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-05-31 08:27:45 +0200'>2017-05-31</span></td><td><a href='/guix/commit/gnu/packages/animation.scm?id=ae44ebb90e2abf4867c6ae24556e3129a3069816'>gnu: synfigstudio: Fix crash on opening files.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-05-28 15:59:52 +0200'>2017-05-28</span></td><td><a href='/guix/commit/gnu/packages/animation.scm?id=2ac2b17251be51778963e6ced0b83e461d175d01'>gnu: synfigstudio: Fix UI bug.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-05-27 22:37:48 +0200'>2017-05-27</span></td><td><a href='/guix/commit/gnu/packages/animation.scm?id=21fea1d1a9316a0eaf7e8e600cc8e6554fc5fb9a'>gnu: synfigstudio: Update to 1.2.0.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>