Also remove output files.

diff --git a/examples/step-52/CMakeLists.txt b/examples/step-52/CMakeLists.txt
index 11618a73e7ed34b79ed75c0a741a6f00bbe97318..af458efbe11a9fd8bfb748b2a3a01f0deac655af 100644 (file)
--- a/examples/step-52/CMakeLists.txt
+++ b/examples/step-52/CMakeLists.txt
@@ -19,6 +19,9 @@ SET(TARGET_SRC
   ${TARGET}.cc
   )
 
+# Define the output that should be cleaned:
+SET(CLEAN_UP_FILES *.vtu)
+
 # Usually, you will not need to modify anything beyond this point...
 
 CMAKE_MINIMUM_REQUIRED(VERSION 2.8.8)