Fix unarr detection on Linux systems that use qmake without pkg-config support

YACReaderLibrary/empty_label_widget.h

@@ -0,0 +1,22 @@
+#ifndef EMPTY_LABEL_WIDGET_H
+#define EMPTY_LABEL_WIDGET_H
+
+#include <QtWidgets>
+#include "empty_container_info.h"
+#include "yacreader_global_gui.h"
+
+class EmptyLabelWidget : public EmptyContainerInfo
+{
+    Q_OBJECT
+public:
+    explicit EmptyLabelWidget(QWidget *parent = 0);
+    void setColor(YACReader::LabelColors color);
+
+signals:
+
+public slots:
+
+protected:
+};
+
+#endif // EMPTY_LABEL_WIDGET_H