Index: settlerlib/CMakeLists.txt
===================================================================
--- settlerlib.orig/CMakeLists.txt
+++ settlerlib/CMakeLists.txt
@@ -9,7 +9,7 @@ catkin_package(DEPENDS Boost calibration
 )
 
 # common commands for building c++ executables and libraries
-include_directories(SYSTEM ${catkin_INCLUDE_DIRS})
+include_directories(${catkin_INCLUDE_DIRS})
 include_directories(include)
 install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/settlerlib/
         DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}