commit ead421b85eeb750cbf7988657015296ed6789bcf
Author: Hodorgasm <nsane457@gmail.com>
Date:   Mon Sep 19 20:27:51 2016 -0400

    Fix "stdlib.h: No such file or directory" errors in GCC-6
    
    Including '-isystem /usr/include' breaks building with GCC-6.
    See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70129

diff --git a/image_geometry/CMakeLists.txt b/image_geometry/CMakeLists.txt
index 3c9cb30..e7c9eea 100644
--- a/image_geometry/CMakeLists.txt
+++ b/image_geometry/CMakeLists.txt
@@ -12,7 +12,7 @@ catkin_package(CATKIN_DEPENDS sensor_msgs
 
 catkin_python_setup()
 
-include_directories(SYSTEM ${catkin_INCLUDE_DIRS}
+include_directories(${catkin_INCLUDE_DIRS}
                            ${OpenCV_INCLUDE_DIRS}
 )
 include_directories(include)