diff --git a/kcms/krdb/krdb.cpp b/kcms/krdb/krdb.cpp
index 46363ddcb..d787f9993 100644
--- a/kcms/krdb/krdb.cpp
+++ b/kcms/krdb/krdb.cpp
@@ -468,7 +468,7 @@ void runRdb(unsigned int flags)
     proc.execute();
 
     // Needed for applications that don't set their own cursor.
-    QProcess::execute(QStringLiteral("xsetroot"), {QStringLiteral("-cursor_name"), QStringLiteral("left_ptr")});
+    QProcess::execute(QStringLiteral(NIXPKGS_XSETROOT), {QStringLiteral("-cursor_name"), QStringLiteral("left_ptr")});
 
     applyGtkStyles(1);
     applyGtkStyles(2);
diff --git a/startkde/plasma-session/startup.cpp b/startkde/plasma-session/startup.cpp
index ffec07ebf..11e70fef8 100644
--- a/startkde/plasma-session/startup.cpp
+++ b/startkde/plasma-session/startup.cpp
@@ -176,7 +176,7 @@ Startup::Startup(QObject *parent)
     }
 
     // Keep for KF5; remove in KF6 (KInit will be gone then)
-    QProcess::execute(QStringLiteral(CMAKE_INSTALL_FULL_LIBEXECDIR_KF5 "/start_kdeinit_wrapper"), QStringList());
+    QProcess::execute(QStringLiteral(NIXPKGS_START_KDEINIT_WRAPPER), QStringList());
 
     KJob *phase1 = nullptr;
     m_lock.reset(new QEventLoopLocker);
diff --git a/startkde/startplasma-wayland.cpp b/startkde/startplasma-wayland.cpp
index 04875c358..5822af37c 100644
--- a/startkde/startplasma-wayland.cpp
+++ b/startkde/startplasma-wayland.cpp
@@ -89,7 +89,7 @@ int main(int argc, char **argv)
     out << "startplasma-wayland: Shutting down...\n";
 
     // Keep for KF5; remove in KF6 (KInit will be gone then)
-    runSync(QStringLiteral("kdeinit5_shutdown"), {});
+    runSync(QStringLiteral(NIXPKGS_KDEINIT5_SHUTDOWN), {});
 
     out << "startplasmacompositor: Shutting down...\n";
     cleanupPlasmaEnvironment(oldSystemdEnvironment);
diff --git a/startkde/startplasma-x11.cpp b/startkde/startplasma-x11.cpp
index 8e82e29c3..1ed176706 100644
--- a/startkde/startplasma-x11.cpp
+++ b/startkde/startplasma-x11.cpp
@@ -87,7 +87,7 @@ int main(int argc, char **argv)
     out << "startkde: Shutting down...\n";
 
     // Keep for KF5; remove in KF6 (KInit will be gone then)
-    runSync(QStringLiteral("kdeinit5_shutdown"), {});
+    runSync(QStringLiteral(NIXPKGS_KDEINIT5_SHUTDOWN), {});
 
     cleanupPlasmaEnvironment(oldSystemdEnvironment);
 
diff --git a/startkde/startplasma.cpp b/startkde/startplasma.cpp
index b0158c97d..c8f7fe223 100644
--- a/startkde/startplasma.cpp
+++ b/startkde/startplasma.cpp
@@ -50,7 +50,7 @@ void sigtermHandler(int signalNumber)
 void messageBox(const QString &text)
 {
     out << text;
-    runSync(QStringLiteral("xmessage"), {QStringLiteral("-geometry"), QStringLiteral("500x100"), text});
+    runSync(QStringLiteral(NIXPKGS_XMESSAGE), {QStringLiteral("-geometry"), QStringLiteral("500x100"), text});
 }
 
 QStringList allServices(const QLatin1String &prefix)
@@ -484,7 +484,7 @@ QProcess *setupKSplash()
         if (ksplashCfg.readEntry("Engine", QStringLiteral("KSplashQML")) == QLatin1String("KSplashQML")) {
             p = new QProcess;
             p->setProcessChannelMode(QProcess::ForwardedChannels);
-            p->start(QStringLiteral("ksplashqml"), {ksplashCfg.readEntry("Theme", QStringLiteral("Breeze"))});
+            p->start(QStringLiteral(CMAKE_INSTALL_FULL_BINDIR "/ksplashqml"), {ksplashCfg.readEntry("Theme", QStringLiteral("Breeze"))});
         }
     }
     return p;