diff -ur telldus-core-2.1.2/service/CMakeLists.txt telldus-core-2.1.2-lunar/service/CMakeLists.txt
--- telldus-core-2.1.2/service/CMakeLists.txt	2014-03-31 12:30:09.000000000 +0200
+++ telldus-core-2.1.2-lunar/service/CMakeLists.txt	2015-01-17 17:48:54.153137887 +0100
@@ -255,13 +255,17 @@
 
 IF (UNIX AND NOT APPLE)
 	INSTALL(TARGETS ${telldus-service_TARGET} RUNTIME DESTINATION sbin)
-	INSTALL(FILES tellstick.conf
-		DESTINATION ${SYSCONF_INSTALL_DIR}
-	)
-	INSTALL(FILES telldus-core.conf
-		DESTINATION ${STATE_INSTALL_DIR}
-		PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ GROUP_WRITE WORLD_READ WORLD_WRITE
-	)
+  IF (NOT EXISTS ${SYSCONF_INSTALL_DIR}/tellstick.conf)
+  	INSTALL(FILES tellstick.conf
+	  	DESTINATION ${SYSCONF_INSTALL_DIR}
+   	)
+  ENDIF()
+  IF (NOT EXISTS ${STATE_INSTALL_DIR}/telldus-core.conf)
+  	INSTALL(FILES telldus-core.conf
+	  	DESTINATION ${STATE_INSTALL_DIR}
+	   	PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ GROUP_WRITE WORLD_READ WORLD_WRITE
+	  )
+  ENDIF()
 ENDIF (UNIX AND NOT APPLE)
 
 IF(ENABLE_TESTING)