Do you have a specific requirement to run cmake version 2.8.9? Version 2.8.7 is available from the repositories and can be installed by running the command sudo apt-get install cmake
If you must compile a version yourself you will need to run the make install command as sudo make install
as your application needs permissions to install itself into the filesystem.
To check for cmake files after compilation, run the command sudo updatedb
and then locate cmake
Finally, run cmake
from the command line, without any options, specified and you should get some output on using various command flags if the application compiled correctly.
Update: rolled up previous comments into this answer.