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;
 }
 
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<option value='grep'>log msg</option>
<option value='author'>author</option>
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<div class='path'>path: <a href='/guix/log/?id=c9fad6a2ad8c530ba5a5a78f6e9349a038e8ae88'>root</a>/<a href='/guix/log/etc?id=c9fad6a2ad8c530ba5a5a78f6e9349a038e8ae88'>etc</a>/<a href='/guix/log/etc/substitutes?id=c9fad6a2ad8c530ba5a5a78f6e9349a038e8ae88'>substitutes</a>/<a href='/guix/log/etc/substitutes/ci.guix.gnu.org.pub?id=c9fad6a2ad8c530ba5a5a78f6e9349a038e8ae88'>ci.guix.gnu.org.pub</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/etc/substitutes/ci.guix.gnu.org.pub?id=c9fad6a2ad8c530ba5a5a78f6e9349a038e8ae88&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-10 00:11:00 +0200'>2020-07-10</span></td><td><a href='/guix/commit/etc/substitutes/ci.guix.gnu.org.pub?id=d283bb960f927dd5f7bb8b96bc697221e4e8ad39'>maint: Remove traces of "berlin.guixsd.org".</a><span class='msg-avail'>...<span class='msg-tooltip'>The guixsd.org domain is no longer advertised since before in 1.0.0
release in May 2019.

* etc/substitutes/berlin.guixsd.org.pub: Rename to...
* etc/substitutes/berlin.guix.gnu.org.pub: ... this.
* etc/substitutes/ci.guix.gnu.org.pub,
etc/substitutes/ci.guix.info.pub: Adjust accordingly.
* gnu/services/base.scm (%default-authorized-guix-keys): Likewise.
* guix/build/download-nar.scm (urls-for-item): Likewise.
* guix/self.scm (miscellaneous-files): Likewise.
* Makefile.am (dist_pkgdata_DATA): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>