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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<div class='path'>path: <a href='/guix/log/?id=7f081f43ed027fcf00a5fe7ab516586c80ed1cec'>root</a>/<a href='/guix/log/nix?id=7f081f43ed027fcf00a5fe7ab516586c80ed1cec'>nix</a>/<a href='/guix/log/nix/libutil?id=7f081f43ed027fcf00a5fe7ab516586c80ed1cec'>libutil</a>/<a href='/guix/log/nix/libutil/util.hh?id=7f081f43ed027fcf00a5fe7ab516586c80ed1cec'>util.hh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/libutil/util.hh?id=7f081f43ed027fcf00a5fe7ab516586c80ed1cec&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-08 22:30:07 +0100'>2020-12-08</span></td><td><a href='/guix/commit/nix/libutil/util.hh?id=2e308238ad09e9527f9b8c3ec4a90b6b05a93367'>daemon: 'Agent' constructor takes a list of environment variables.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/libutil/util.hh (struct Agent)[Agent]: Add 'env' parameter.
* nix/libutil/util.cc (Agent::Agent): Honor it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-14 15:42:55 +0200'>2020-09-14</span></td><td><a href='/guix/commit/nix/libutil/util.hh?id=ee9dff34f9317509cb2b833d07a0d5e01a36a4ae'>daemon: Move 'Agent' to libutil.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/libstore/build.cc (DerivationGoal::tryBuildHook): Add "offload" to
'args' and pass settings.guixProgram as the first argument to
Agent::Agent.
(pathNullDevice, commonChildInit, Agent, Agent::Agent)
(Agent::~Agent): Move to...
* nix/libutil/util.cc: ... here.
* nix/libutil/util.hh (struct Agent, commonChildInit): New
declarations.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-12 00:19:09 +0100'>2020-01-12</span></td><td><a href='/guix/commit/nix/libutil/util.hh?id=7033c7692ccbbbad8f7b9952015de071a5588e87'>daemon: Account for deleted store files when deduplication is on.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously, a store item that is a regular file would not be accounted
for in the 'bytesFreed' value computed by 'deletePath' because its
'st_nlink' count would always be &gt;= 2.  This commit fixes that.

* nix/libutil/util.hh (deletePath): Add optional 'linkThreshold' argument.
* nix/libutil/util.cc (_deletePath): Add 'linkThreshold' argument and
honor it.  Pass it down in recursive call.
(deletePath): Add 'linkThreshold' and honor it.
* nix/libstore/gc.cc (LocalStore::deleteGarbage): Pass 'linkThreshold'
argument to 'deletePath', with a value of 2 when PATH is a store item
and deduplication is on.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-08-18 11:31:28 +0200'>2017-08-18</span></td><td><a href='/guix/commit/nix/libutil/util.hh?id=ed464f48efd80e6439441d7a9f6d0e7988fb1272'>nix: Remove unused function.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/libutil/util.hh:
* nix/libutil/util.cc (decodeOctalEscaped): Remove unused and buggy function.
</span></span></td><td>Andy Wingo</td></tr>