diff --git a/toonz/sources/include/toonzqt/schematicnode.h b/toonz/sources/include/toonzqt/schematicnode.h
index e4564408..bc85196b 100644
--- a/toonz/sources/include/toonzqt/schematicnode.h
+++ b/toonz/sources/include/toonzqt/schematicnode.h
@@ -43,19 +43,23 @@ protected:
   void focusOutEvent(QFocusEvent *fe) override;
 
   void keyPressEvent(QKeyEvent *ke) override;
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
   void contextMenuEvent(QGraphicsSceneContextMenuEvent *cme) override;
+#endif
 
 signals:
   void focusOut();
 
 protected slots:
   void onContentsChanged();
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
   void onPopupHide();
   void onCut();
   void onCopy();
   void onPaste();
   void onDelete();
   void onSelectAll();
+#endif
 };
 
 //========================================================
diff --git a/toonz/sources/toonzqt/schematicnode.cpp b/toonz/sources/toonzqt/schematicnode.cpp
index 415ce131..ecc87fca 100644
--- a/toonz/sources/toonzqt/schematicnode.cpp
+++ b/toonz/sources/toonzqt/schematicnode.cpp
@@ -20,11 +20,13 @@
 #include "toonzqt/menubarcommand.h"
 #include "toonzqt/gutil.h"
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
 #define ACCEL_KEY(k)                                                           \
   (!QCoreApplication::testAttribute(Qt::AA_DontShowShortcutsInContextMenus)    \
        ? QLatin1Char('\t') +                                                   \
              QKeySequence(k).toString(QKeySequence::NativeText)                \
        : QString())
+#endif
 
 //========================================================
 //
@@ -43,6 +45,7 @@ SchematicName::SchematicName(QGraphicsItem *parent, double width, double height)
   setFlag(QGraphicsItem::ItemIsFocusable, true);
   setTextInteractionFlags(Qt::TextEditorInteraction);
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
   popup = new QMenu();
   popup->setObjectName(QLatin1String("qt_edit_menu"));
 
@@ -69,14 +72,20 @@ SchematicName::SchematicName(QGraphicsItem *parent, double width, double height)
                       this, SLOT(onSelectAll()));
   actionSelectAll->setObjectName(QStringLiteral("select-all"));
 
+  connect(popup, SIGNAL(aboutToHide()), this, SLOT(onPopupHide()));
+#endif
+
   connect(document(), SIGNAL(contentsChanged()), this,
           SLOT(onContentsChanged()));
-  connect(popup, SIGNAL(aboutToHide()), this, SLOT(onPopupHide()));
 }
 
 //--------------------------------------------------------
 
-SchematicName::~SchematicName() { delete popup; }
+SchematicName::~SchematicName() {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+  delete popup;
+#endif
+}
 
 //--------------------------------------------------------
 
@@ -154,6 +163,7 @@ bool SchematicName::eventFilter(QObject *object, QEvent *event) {
 void SchematicName::focusInEvent(QFocusEvent *fe) {
   QGraphicsTextItem::focusInEvent(fe);
   qApp->installEventFilter(this);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
   if (!m_refocus) {
     QTextDocument *doc = document();
     QTextCursor cursor(doc->begin());
@@ -161,10 +171,16 @@ void SchematicName::focusInEvent(QFocusEvent *fe) {
     setTextCursor(cursor);
     m_curName = toPlainText();
   }
+#else
+  QTextDocument *doc = document();
+  QTextCursor cursor(doc->begin());
+  cursor.select(QTextCursor::Document);
+#endif
 }
 
 //--------------------------------------------------------
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
 void SchematicName::contextMenuEvent(QGraphicsSceneContextMenuEvent *cme) {
   QClipboard *clipboard = QApplication::clipboard();
   QTextCursor cursor    = textCursor();
@@ -269,6 +285,7 @@ void SchematicName::onSelectAll() {
   cursor.select(QTextCursor::Document);
   setTextCursor(cursor);
 }
+#endif
 
 //========================================================
 //