cmake question on RedHat Linux 64

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http://unix.stackexchange.com – I am new with building software using cmake. I want to install VTK using cmake. I downloaded the .tar file and un-tared it. This leaves me with a directory that contains some cmake files and some other stuff. Suppose I have un-tared all files in the directory /HOME/USER/SETUP_FILES/ and created a directory /HOME/USER/SETUP_FILES/BUILD When I cd into /HOME/USER/SETUP_FILES/BUILD and execute cmake ../. I am able to configure the build. In the configuration file, I can choose to define CMAKE_INSTALL_PREFIX My first question is: 1) What should I enter there? When I enter for example /HOME/ (HowTos)