diff --git a/src/luaengine/main.cpp b/src/luaengine/main.cpp
index 4f64aa0..5897553 100644
--- a/src/luaengine/main.cpp
+++ b/src/luaengine/main.cpp
@@ -26,23 +26,23 @@
 
 int main(int argc, char *argv[])
 {
-#if QT_VERSION <= QT_VERSION_CHECK(6, 0, 0)
+#if QT_VERSION >= 0x060000
     QApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
 #endif
     QApplication a(argc, argv);
 
 #ifdef Q_OS_WIN
-#if QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)
-    if (QSysInfo::windowsVersion() >= 0x0080)
-    {
+#if QT_VERSION >= 0x050400
+    if (QSysInfo::windowsVersion() >= 0x0080) {
         a.setFont(QApplication::font("QMenu"));
     }
 #endif
 #endif
 
     QVariantList arguments;
-    for (const QString &argument : a.arguments()) {
+    const QStringList appArgs = a.arguments();
+    for (const QString &argument : appArgs) {
         arguments << QVariant::fromValue(argument);
     }
 
@@ -52,7 +52,11 @@ int main(int argc, char *argv[])
         QVariant scriptPath = arguments.first();
         QFile luaScript(scriptPath.toString());
         if (!luaScript.open(QIODevice::ReadOnly)) {
+#if QT_VERSION >= 0x050F00
             QTextStream(stderr) << "Error: Failed to open \"" << arguments.first().toString() << "\"." << Qt::endl;
+#else
+            QTextStream(stderr) << "Error: Failed to open \"" << arguments.first().toString() << "\"." << endl;
+#endif
             return 1;
         }
 
diff --git a/src/luaenginecli/main.cpp b/src/luaenginecli/main.cpp
index 4c88a13..c862971 100644
--- a/src/luaenginecli/main.cpp
+++ b/src/luaenginecli/main.cpp
@@ -27,7 +27,8 @@ int main(int argc, char *argv[])
     QCoreApplication a(argc, argv);
 
     QVariantList arguments;
-    for (const QString &argument : a.arguments()) {
+    const QStringList appArgs = a.arguments();
+    for (const QString &argument : appArgs) {
         arguments << QVariant::fromValue(argument);
     }
 
@@ -37,7 +38,11 @@ int main(int argc, char *argv[])
         QVariant scriptPath = arguments.first();
         QFile luaScript(scriptPath.toString());
         if (!luaScript.open(QIODevice::ReadOnly)) {
+#if QT_VERSION >= 0x050F00
             QTextStream(stderr) << "Error: Failed to open \"" << arguments.first().toString() << "\"." << Qt::endl;
+#else
+            QTextStream(stderr) << "Error: Failed to open \"" << arguments.first().toString() << "\"." << endl;
+#endif
             return 1;
         }
 
@@ -59,14 +64,14 @@ int main(int argc, char *argv[])
 
         if (luaEngine.executeLuaFunction("main", arguments, true)) {
             QVariant variant = luaEngine.returnVariant();
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#if QT_VERSION >= 0x060000
             if (variant.typeId() == QMetaType::Int || variant.typeId() == QMetaType::LongLong) {
 #else
             if (variant.type() == QVariant::Int || variant.type() == QVariant::LongLong) {
 #endif
                 return variant.toInt();
             }
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#if QT_VERSION >= 0x060000
             else if (variant.typeId() == QMetaType::QString) {
 #else
             else if (variant.type() == QVariant::String) {
diff --git a/src/luaengineos/luaengine/LuaEngineOS.cpp b/src/luaengineos/luaengine/LuaEngineOS.cpp
index 2ca5b7b..7a7466e 100644
--- a/src/luaengineos/luaengine/LuaEngineOS.cpp
+++ b/src/luaengineos/luaengine/LuaEngineOS.cpp
@@ -71,7 +71,11 @@ int LuaEngineOS::executeProcess(lua_State *L_p)
             }
         }
         else {
+#if QT_VERSION >= 0x050F00
+            processReturn = system(getVariant(L_p, 1).toString().toUtf8().constData());
+#else
             processReturn = QProcess::execute(getVariant(L_p, 1).toString());
+#endif
         }
         if (runInBackground && !processSuccessed) {
             processReturn = -2;