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='2020-04-06 15:06:03 +0200'>2020-04-06</span></td><td><a href='/guix/commit/gnu/installer/newt/user.scm?id=d52111450abc93f84e251c768c8cba47d37a48ee'>installer: Adapt to Guile-newt revision 2.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-03-05 23:40:22 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/installer/newt/user.scm?id=63b8c089c1596cd3e814ac13e1a8b3fa45bb2b54'>installer: Implement a dialog on /var/guix/installer-socket.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-23 11:26:54 +0100'>2020-01-23</span></td><td><a href='/guix/commit/gnu/installer/newt/user.scm?id=6bd072ff661031aa0bbace83fc34edea2d7268df'>installer: Make "TRANSLATORS" comment visible.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-08-26 15:56:32 +0200'>2019-08-26</span></td><td><a href='/guix/commit/gnu/installer/newt/user.scm?id=55c43108ac763c68f95cce3d32c60b8944b771f5'>installer: Show, don't Hide.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>