Error while using ROSMAKE

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ROS_FUERTE UBUNTU 10.04

I have followed these instructions.

http://www.ros.org/wiki/gpsd_client/Tutorials/Getting%20Started%20with%20gpsd_client

I have installed the gps_umd package and the ros_package_path is also set properly as just roscd gps_umd takes me to the directory.

when I typed
sudo rosmake --rosdep-install

results in

sudo: rosmake: command not found

and when I type

rosmake gpsd_client

results in

  mkdir -p bin
  cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=`rospack find rosbuild`/rostoolchain.cmake  ..
  Segmentation fault

Please let me know how I can use this stack for my project.

Thanks, Sai