Adopted from NixOS
pkgs/development/libraries/kde-frameworks/kio/samba-search-path.patch

===================================================================
--- kio-5.17.0.orig/src/core/ksambashare.cpp
+++ kio-5.17.0/src/core/ksambashare.cpp
@@ -67,13 +67,18 @@ KSambaSharePrivate::~KSambaSharePrivate(
 
 bool KSambaSharePrivate::isSambaInstalled()
 {
-    if (QFile::exists(QStringLiteral("/usr/sbin/smbd"))
-            || QFile::exists(QStringLiteral("/usr/local/sbin/smbd"))) {
-        return true;
+    const QByteArray pathEnv = qgetenv("PATH");
+    if (!pathEnv.isEmpty()) {
+        QLatin1Char pathSep(':');
+        QStringList paths = QFile::decodeName(pathEnv).split(pathSep, QString::SkipEmptyParts);
+        for (QStringList::iterator it = paths.begin(); it != paths.end(); ++it) {
+            it->append(QStringLiteral("/smbd"));
+            if (QFile::exists(*it)) {
+                return true;
+            }
+        }
     }
 
-    //qDebug() << "Samba is not installed!";
-
     return false;
 }
 
/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>refs</a><a class='active' href='/guix/log/tests/gremlin.scm'>log</a><a href='/guix/tree/tests/gremlin.scm?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>tree</a><a href='/guix/commit/tests/gremlin.scm?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>commit</a><a href='/guix/diff/tests/gremlin.scm?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/gremlin.scm'>
<input type='hidden' name='id' value='bc490e070aaa4ab7511019b2ec2f56b6b05786e8'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option 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=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>root</a>/<a href='/guix/log/tests?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>tests</a>/<a href='/guix/log/tests/gremlin.scm?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8'>gremlin.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/tests/gremlin.scm?id=bc490e070aaa4ab7511019b2ec2f56b6b05786e8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-05-18 12:10:15 +0200'>2019-05-18</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=6b97415996583b15a97dad8254f610275353e913'>gremlin: Adjust tests for foreign distros.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/35775&gt;.

* tests/gremlin.scm ("elf-dynamic-info-needed, executable"): Expect only
libguile and libc among NEEDED.
("strip-runpath"): Pass '--enable-new-dtags' to get RUNPATH, not RPATH.
</span></span></td><td>Ting-Wei Lan</td></tr>
<tr><td><span title='2018-08-25 16:44:07 +0200'>2018-08-25</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=839167ff9d74fc490b32f6a197591964f73b65e5'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-08-21 23:27:08 +0200'>2018-08-21</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=f7dfda2c73a0c4f09b105cafb29c45cf594e4ba9'>gremlin: 'elf-dynamic-info-needed' test is no longer skipped.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/gremlin.scm (%guile-executable): Use /proc/self/exe instead
of (command-line).  For a while now, the first element of (command-line)
was "./build-aux/test-driver.scm"; consequently the test was always
skipped.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-07 11:21:36 +0200'>2018-05-07</span></td><td><a href='/guix/commit/tests/gremlin.scm?id=b178fc236908ad2da86734ea8e01abd3ff8981da'>gremlin: Add 'strip-runpath'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/gremlin.scm (strip-runpath): New procedure.
* tests/gremlin.scm (c-compiler): New variable.
("strip-runpath"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>