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
@@ -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);
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<div class='path'>path: <a href='/guix/log/?id=6e20d190dccccbce33750cbdbe4a95f95bf8d87f'>root</a>/<a href='/guix/log/gnu?id=6e20d190dccccbce33750cbdbe4a95f95bf8d87f'>gnu</a>/<a href='/guix/log/gnu/packages?id=6e20d190dccccbce33750cbdbe4a95f95bf8d87f'>packages</a>/<a href='/guix/log/gnu/packages/autogen.scm?id=6e20d190dccccbce33750cbdbe4a95f95bf8d87f'>autogen.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/autogen.scm?id=6e20d190dccccbce33750cbdbe4a95f95bf8d87f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-13 20:00:29 +0200'>2020-04-13</span></td><td><a href='/guix/commit/gnu/packages/autogen.scm?id=9d89818a359dd0657e4eb7649b29ad4197b8db39'>gnu: autogen: Disable parallel tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/autogen.scm (autogen)[arguments]: Add #:parallel-tests?.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-02-24 17:51:29 +0100'>2019-02-24</span></td><td><a href='/guix/commit/gnu/packages/autogen.scm?id=1584b9d680cf2d48811a5dc68edd872872cbc1a4'>gnu: autogen: Update to 5.18.16.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/autogen.scm (autogen): Update to 5.18.16.
[inputs]: Update to guile-2.2.
[arguments]: Add ‘--disable-dependency-tracking’ to #:configure-flags.
Re-indent.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-08-09 02:17:24 +0200'>2018-08-09</span></td><td><a href='/guix/commit/gnu/packages/autogen.scm?id=11c8a6491249e63e98d902d7396b9ac0a2bca947'>gnu: autogen: Update to 5.18.14.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/autogen.scm (autogen): Update to 5.18.14.
[inputs]: Move perl from native-inputs to here...
[native-inputs]: ...and which from inputs to here.
[arguments]: Remove unnecessary ‘/usr/bin/tr’ substitution.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>