OTHER: guard headerfiles against multiple inclusion

src/SkinChooser.h

@@ -13,6 +13,8 @@
  *  GNU General Public License for more details.
  */
 
+#ifndef __SKINCHOOSER__
+#define __SKINCHOOSER__
 
 #include <QListWidget>
 #include <QDialog>
@@ -53,3 +55,4 @@ class SkinChooser : public QDialog
 
 };
 
+#endif

src/application.h

@@ -13,6 +13,9 @@
  *  GNU General Public License for more details.
  */
 
+#ifndef __APPLICATION__
+#define __APPLICATION__
+
 #include <QApplication>
 
 class XClient;
@@ -54,3 +57,5 @@ class Application : public QApplication
 	private:
 		bool m_timemode_reverse;
 };
+
+#endif