If you just `make`, you will have a "usr" directory inside your julia source directory. Inside that usr directory is a directory structure very similar to what would be found in /usr/local, which is where Julia gets installed when you `sudo make install`.
To run julia from within this other directory, you just need to do one of the following:
* Run julia directly via `cd <julia_dir>/usr/bin`, and then `./julia`
* Add that bin directory to your path: `export PATH=$PATH:<julia_dir>/usr/bin`
Where <julia_dir> is the directory that the source code of julia is located at. Note that if you put that PATH line in your .bashrc it will get run automatically when you open a new terminal.
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