rosmake failed for g2o

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hi

i want to install rgbdslam package. so i used the svn co link. in that i followed the readme file and i tried to install g2o. when i gave rosmake i got following error:

root@mutu-Vostro-3550:/opt/ros/electric/stacks/g2o# rosmake --rosdep-install [ rosmake ] No package specified. Building ['g2o']
[ rosmake ] Packages requested are: ['g2o']
[ rosmake ] Logging to directory/home/mutu/.ros/rosmake/rosmake_output-20120416-145054 [ rosmake ] Expanded args ['g2o'] to: ['g2o']
[ rosmake ] Generating Install Script using rosdep then executing. This may take a minute, you will be prompted for permissions. . . Failed to find rosdep suitesparse for package g2o on OS:ubuntu version:oneiric [ rosmake ] rosdep install failed: Rosdep install failed

if rosmake fails the readme file has the next step.i did it, but i got the following:

root@mutu-Vostro-3550:/opt/ros/electric/stacks/g2o# sudo apt-get install libsuitesparse-dev libcsparse2.2.3 Reading package lists... Done Building dependency tree
Reading state information... Done libcsparse2.2.3 is already the newest version. libsuitesparse-dev is already the newest version.

what to do?