Downloading and Building and Installing! Oh my!

The first step was to download the most current ITK tar.gz from their site as well as installing CMake.  CMake is a cross-platform, open-source build system.  ITK uses CMake to control the software compilation process so that updates can be compiled more independently.  CMake can be downloaded as pre-compiled binaries, and therefore needs no installation itself.

First, make a directory to contain the ITK content:
$ sudo mkdir /usr/local/itk

Navigate into the itk directory:

$ cd /usr/local/itk

Extract the itk files: and delete the tar.gz:

$ sudo tar xvzf InsightToolkit-3.14.0.tar.gz

Delete the tar.gz, since it is no longer necessary:

$ sudo rm -rf InsightToolkit-3.14.0.tar.gz

Next, create a bin directory:

$ sudo mkdir /usr/local/itk/InsightToolkit-3.14.0/bin

Navigate into the bin directory: 

$ cd /usr/local/itk/InsightToolkit-3.14.0/bin

Run CMake to compile: 

$ sudo ccmake -DITK_USE_REVIEW=ON ..

This will open the CMake GUI.

Press 'c' to compile.

Wait for the compile to finish.

Press 'g' to generate the make files.

Now install:
$ sudo make -j4

$ sudo make install

Tada, ITK is now installed!