The Hazel code is written in fortran 90 and uses IDL and python for the widget versions. First thing to do is uncompress the hazel.tar.gz file. You will find several directories. For compiling the nonparallel version of the code (the one that we will use in the course) go first to the “Source” directory and type “make all”. The code uses the intel fortran compiler by default (ifort). In case the compiler is different the “makefile” file contained in the run directory should be modified accordingly. There are also other options in the makefile that you may need to modify in particular case. The code has been fully tested in linux and mac (Yosemite) with the ifort compiler and in linux with the “gfortran” compiler. 

After compiling, the executable is copied into the run directory. There you should be able to run the code with the appropriate input files. In the folder Manual you will find a lot more information.