diff --git a/MainWindow.cpp b/MainWindow.cpp
index 863a3bd..21a2f99 100644
--- a/MainWindow.cpp
+++ b/MainWindow.cpp
@@ -428,6 +428,7 @@ bool MainWindow::eventFilter(QObject *obj, QEvent *event)
 void MainWindow::keyPressEvent(QKeyEvent *event)
 {
 #ifdef Q_OS_OSX // On Mac OS X
+  Q_UNUSED(event);
   // Do nothing
 #endif
 
diff --git a/Polygon.cpp b/Polygon.cpp
index 5198e67..6b4882e 100644
--- a/Polygon.cpp
+++ b/Polygon.cpp
@@ -34,9 +34,6 @@ void Polygon::_constrainVertex(const QPolygonF& polygon, int i, QPointF& v)
   if (polygon.size() <= 3)
     return;
 
-  // Save previous position of vertex.
-  QPointF prevV = polygon.at(i);
-
   // Look at the two adjunct segments to vertex i and see if they
   // intersect with any non-adjacent segments.
 
diff --git a/ShapeGraphicsItem.cpp b/ShapeGraphicsItem.cpp
index 605b6d2..678ffd0 100644
--- a/ShapeGraphicsItem.cpp
+++ b/ShapeGraphicsItem.cpp
@@ -111,6 +111,8 @@ void ShapeGraphicsItem::paint(QPainter *painter,
 void ColorGraphicsItem::_prePaint(QPainter *painter,
                                   const QStyleOptionGraphicsItem *option)
 {
+  Q_UNUSED(option);
+
   Color* color = static_cast<Color*>(getMapping()->getPaint().data());
   Q_ASSERT(color);
 
diff --git a/main.cpp b/main.cpp
index 4f6cbde..237d042 100644
--- a/main.cpp
+++ b/main.cpp
@@ -142,9 +142,6 @@ int main(int argc, char *argv[])
   splash.showMessage("  " + QObject::tr("Initiating program..."),
                      Qt::AlignLeft | Qt::AlignTop, MM::WHITE);
 
-  bool FORCE_FRENCH_LANG = false;
-  // set_language_to_french(app);
-
   // Let splash for at least one second.
   I::sleep(1);