*\<source directory\> is the root `isis` directory of the ISIS source tree, i.e. `/scratch/this_is_an_example/ISIS3/isis`. From the build directory, this is `../isis`
* Set your ISISROOT to `/the/path/to/your/build`:
*`export ISISROOT=$(pwd)`
***For internal instructions, see `Details` section below.**
*\<source directory\> is the root `isis` directory of the ISIS source tree, i.e. `/scratch/this_is_an_example/ISIS3/isis`. From the build directory, this is `../isis`
* Build ISIS inside of your build directory and install it to your install directory: