Search the "extra libs" in GUIX_KF5INIT_LIB_PATH (which basically is a
collection of all /lib directories). We can not hard-code the full path to the
libsKF5Plasam, since adding palse-workspace

Adopted from NixOS
pkgs/development/libraries/kde-frameworks/kinit/kdeinit-extra_libs.patch

===================================================================
--- kinit-5.32.0/src/kdeinit/kinit-5.32.0/src/kdeinit/.orig
+++ kinit-5.32.0/src/kdeinit/kinit.cpp
@@ -96,9 +96,9 @@
     "libKF5Parts.5.dylib",
     "libKF5Plasma.5.dylib"
 #else
-    "libKF5KIOCore.so.5",
-    "libKF5Parts.so.5",
-    "libKF5Plasma.so.5"
+    "GUIX_PKGS_KF5_KIO/lib/libKF5KIOCore.so.5",
+    "GUIX_PKGS_KF5_PARTS/lib/libKF5Parts.so.5",
+    "GUIX_PKGS_KF5_PLASMA/lib/libKF5Plasma.so.5"
 #endif
 };
 #endif
@@ -1533,20 +1531,6 @@ static int initXconnection()
 }
 #endif
 
-#ifndef Q_OS_OSX
-// Find a shared lib in the lib dir, e.g. libkio.so.
-// Completely unrelated to plugins.
-static QString findSharedLib(const QString &lib)
-{
-    QString path = QFile::decodeName(CMAKE_INSTALL_PREFIX "/" LIB_INSTALL_DIR "/") + lib;
-    if (QFile::exists(path)) {
-        return path;
-    }
-    // We could also look in LD_LIBRARY_PATH, but really, who installs the main libs in different prefixes?
-    return QString();
-}
-#endif
-
 extern "C" {
 
     static void secondary_child_handler(int)
@@ -1673,7 +1673,7 @@
 #if defined(Q_OS_UNIX) && !defined(Q_OS_OSX)
     if (!d.suicide && qEnvironmentVariableIsEmpty("KDE_IS_PRELINKED")) {
         for (const char *extra_lib : extra_libs) {
-            const QString extra = findSharedLib(QString::fromLatin1(extra_lib));
+            const QString extra = QString::fromLatin1(extra_lib);
             if (!extra.isEmpty()) {
                 QLibrary l(extra);
                 l.setLoadHints(QLibrary::ExportExternalSymbolsHint);
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=8b09f1ce988841f37d80017ee2e953949dcc30a5'>root</a>/<a href='/guix/log/gnu?id=8b09f1ce988841f37d80017ee2e953949dcc30a5'>gnu</a>/<a href='/guix/log/gnu/packages?id=8b09f1ce988841f37d80017ee2e953949dcc30a5'>packages</a>/<a href='/guix/log/gnu/packages/hardware.scm?id=8b09f1ce988841f37d80017ee2e953949dcc30a5'>hardware.scm</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/gnu/packages/hardware.scm?id=8b09f1ce988841f37d80017ee2e953949dcc30a5&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-24 17:21:55 +0100'>2019-03-24</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=d9f7b116da0f8ea06f299b112b8f3612a5206756'>gnu: ddcutil: Update to 0.9.5.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (ddcutil): Update to 0.9.5.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-02-17 03:37:48 +0100'>2019-02-17</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=a11c7a0b22ac0ec24618a69340648bc510daa00e'>gnu: wavemon: Update to 0.9.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (wavemon): Update to 0.9.0.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-02-17 03:37:47 +0100'>2019-02-17</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=ec756fa58cc9b8379b84bc048fcc143798971a57'>gnu: ddcutil: Update to 0.9.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (ddcutil): Update to 0.9.4.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-10-24 03:58:20 +0200'>2018-10-24</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=0ba0ab814ad12af964d0b7f6e8ef3c50e5815264'>gnu: Add wavemon.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (wavemon): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-10-04 04:20:06 +0200'>2018-10-04</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=9e783d0bf22a7ff965105eb45f6c179a832bbabf'>gnu: ddcutil: Update to 0.9.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (ddcutil): Update to 0.9.2.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-10-04 04:20:04 +0200'>2018-10-04</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=fb5412511479c19b3e4c884e9cc65e652ea923e2'>gnu: Add memtester.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (memtester): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-10-04 04:20:04 +0200'>2018-10-04</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=5eff43804eaed5744967f83edbaeb7ffdb77aec1'>gnu: Add memtest86+.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (memtest86+): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-08-30 19:28:10 +0200'>2018-08-30</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=6e8c75b88435550906e251dd4a9c2eb732f803d4'>gnu: Add msr-tools.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm (msr-tools): New public variable.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-08-30 19:28:10 +0200'>2018-08-30</span></td><td><a href='/guix/commit/gnu/packages/hardware.scm?id=aadd1d241cc9891a857dda9a5cf8389673b3c76c'>gnu: Add ddcutil.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/hardware.scm: New file.
(ddcutil): New public variable.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add the new file.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>