--- CMakeLists.txt.orig	2011-04-28 01:19:54.232041312 +0200
+++ CMakeLists.txt	2011-04-28 01:15:11.434101391 +0200
@@ -43,6 +43,8 @@
 set(${PROJECT_NAME}_VERSION_MINOR "4")
 set(${PROJECT_NAME}_VERSION_PATCH "1")
 
+add_definitions(-DG4_STORE_TRAJECTORY)
+
 #------------------------------------------------------------------------------
 # Set up path to internal set of CMake modules.
 #