set default compile flag for HAVE_G2O to FALSE

svo/CMakeLists.txt

@@ -2,7 +2,7 @@
 # user build settings
 
 SET(TRACE TRUE)
-SET(HAVE_G2O TRUE) 
+SET(HAVE_G2O FALSE) 
 SET(USE_ROS TRUE) # Set FALSE if you want to build this package without Catkin
 SET(DEBUG_OUTPUT FALSE) # Only relevant if build without ROS