Installing Object_Recognition_Core on ubuntu python link errors

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Hi,

I am trying to install object_recognition_core by following the instructions on this website wg-perception.github.io/object_recognition_core/install.html#install

Upon running catkin_make it gets to 100% then fails with the following link errors:

    /home/aly/workspace/ork/devel/lib/libobject_recognition_core_common.so: error: undefined reference to 'PyObject_Size'
/home/aly/workspace/ork/devel/lib/libobject_recognition_core_common.so: error: undefined reference to 'PyErr_Occurred'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libboost_python.so: error: undefined reference to 'PyList_Insert'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libboost_python.so: error: undefined reference to 'PyExc_ImportError'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libboost_python.so: error: undefined reference to 'PyString_InternFromString'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libboost_python.so: error: undefined reference to 'PyProperty_Type'
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../lib/libboost_python.so: error: undefined reference to 'PyString_AsString'

and many more similar errors followed by:

collect2: ld returned 1 exit status
make[2]: *** [ork/devel/lib/object_recognition_ros/object_information_server] Error 1
make[1]: *** [object_recognition_ros/src/info_service/CMakeFiles/object_information_server.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Any idea why these are failing, my python version is 2.7.3

Thanks