Add optional Destdir-variable

Makefile

@@ -6,12 +6,12 @@ default: install
 
 install:
 	# Deploy script
-	cp -f ./event_screensaver ${SCRIPT_PATH}
+	cp -f ./event_screensaver ${DESTDIR}${SCRIPT_PATH}
 	# Make executeable
-	chmod +x ${SCRIPT_PATH}
+	chmod +x ${DESTDIR}${SCRIPT_PATH}
 
 	# Deploy notifyrc-file
-	cp ./ksmserver.notifyrc ${KSMSERVER_NOTIFY_CONFIG_PATH}
+	cp ./ksmserver.notifyrc ${DESTDIR}${KSMSERVER_NOTIFY_CONFIG_PATH}
 
 	# Reload kwin..
 	qdbus org.kde.KWin /KWin reconfigure
@@ -21,7 +21,7 @@ install:
 
 remove:
 	# Remove files..
-	rm ${SCRIPT_PATH} ${KSMSERVER_NOTIFY_CONFIG_PATH}
+	rm ${DESTDIR}${SCRIPT_PATH} ${DESTDIR}${KSMSERVER_NOTIFY_CONFIG_PATH}
 
 	# Reload kwin..
 	qdbus org.kde.KWin /KWin reconfigure