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);
tion value='committer'>committer</option>
<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=023b3ca6e5c45409b5622098cf06ea9c61f3d5b3'>root</a>/<a href='/guix/log/gnu?id=023b3ca6e5c45409b5622098cf06ea9c61f3d5b3'>gnu</a>/<a href='/guix/log/gnu/packages?id=023b3ca6e5c45409b5622098cf06ea9c61f3d5b3'>packages</a>/<a href='/guix/log/gnu/packages/kde-frameworks.scm?id=023b3ca6e5c45409b5622098cf06ea9c61f3d5b3'>kde-frameworks.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/kde-frameworks.scm?id=023b3ca6e5c45409b5622098cf06ea9c61f3d5b3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-05-11 00:32:57 +0200'>2022-05-11</span></td><td><a href='/guix/commit/gnu/packages/kde-frameworks.scm?id=6c777feb3eb9fb594fe731b3da081faea28cf31c'>gnu: extra-cmake-modules: Update to 5.91.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/kde-frameworks.scm (extra-cmake-modules): Update to 5.91.0.
Fix the indentation.
[native-inputs]: Use label-less input style.
[arguments]: Use G-expresssions.
&lt;phases&gt;: In phase 'fix-lib-path', use QT_MAJOR_VERSION to determine the
installation path, Fix the compatibility with different Qt version.
Add phase 'fix-test' to workaround with the broken KDEFetchTranslations test.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Zhu Zihao</td></tr>
<tr><td><span title='2022-03-29 14:43:20 +0300'>2022-03-29</span></td><td><a href='/guix/commit/gnu/packages/kde-frameworks.scm?id=d9710380a4bba4783ed836dcbdd39bb393836950'>gnu: pulseaudio-qt: Use mirror URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/kde-frameworks.scm (pulseaudio-qt)[source]: Use kde
mirror URI.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-03-11 23:34:50 -0500'>2022-03-11</span></td><td><a href='/guix/commit/gnu/packages/kde-frameworks.scm?id=fbc46b61daca05f8f8082fc90a62a5708415d651'>gnu: extra-cmake-modules: Don't run tests when cross-compiling.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/kde-frameworks.scm
  (extra-cmake-modules)[arguments]&lt;#:tests?&gt;: Set to #false when
  cross-compiling.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Maxime Devos</td></tr>