RGBDSLAMv2 missing siftgpu library error

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Hi, My system is Ubuntu 12.04. In the 3rd step of the installation instructions, a get an error about the missing siftgpu library. I execute "catkin_make" command again but I'm still having same problem;

...

[ 67%] Building CXX object rgbdslam_v2-hydro/CMakeFiles/rgbdslam.dir/src/header.o

[ 69%] Building CXX object rgbdslam_v2-hydro/CMakeFiles/rgbdslam.dir/src/sift_gpu_wrapper.o

Linking CXX executable /home/oguzhan/rgbdslam_catkin_ws/devel/lib/rgbdslam/rgbdslam

/usr/bin/ld: cannot find -lsiftgpu

collect2: error: ld returned 1 exit status

make[2]: * [/home/oguzhan/rgbdslam_catkin_ws/devel/lib/rgbdslam/rgbdslam] Error 1

make[1]: * [rgbdslam_v2-hydro/CMakeFiles/rgbdslam.dir/all] Error 2

make: * [all] Error 2 Invoking "make" failed

second make:

oguzhan@ubuntu:~/rgbdslam_catkin_ws$ catkin_make

Base path: /home/oguzhan/rgbdslam_catkin_ws

Source space: /home/oguzhan/rgbdslam_catkin_ws/src

Build space: /home/oguzhan/rgbdslam_catkin_ws/build

Devel space: /home/oguzhan/rgbdslam_catkin_ws/devel

Install space: /home/oguzhan/rgbdslam_catkin_ws/install

Running command: "make cmake_check_build_system" in "/home/oguzhan/rgbdslam_catkin_ws/build"

Running command: "make -j1 -l1" in "/home/oguzhan/rgbdslam_catkin_ws/build"

[ 7%] Built target rgbdslam_generate_messages_cpp

[ 7%] Built target rgbdslam_gencpp

Linking CXX executable /home/oguzhan/rgbdslam_catkin_ws/devel/lib/rgbdslam/rgbdslam

/usr/bin/ld: cannot find -lsiftgpu

collect2: error: ld returned 1 exit status

make[2]: * [/home/oguzhan/rgbdslam_catkin_ws/devel/lib/rgbdslam/rgbdslam] Error 1

make[1]: * [rgbdslam_v2-hydro/CMakeFiles/rgbdslam.dir/all] Error 2

make: * [all] Error 2

Invoking "make" failed