Set environment variables

The export commands below work in the bash shell. The syntax may be different in other shells.


To use the Fortran versions of Clawpack you will need to set the environment variable CLAW to point to the top level of clawpack tree (there is no need to perform this step if you will only use PyClaw). In the bash shell these can be set via:

export CLAW=/full/path/to/clawpack  # to top level clawpack directory


You also need to set FC to point to the desired Fortran compiler, e.g.:

export FC=gfortran   # or other preferred Fortran compiler

Consider putting the two commands above in a file that is executed every time you open a new shell or terminal window. On Linux machines with the bash shell this is generally the file .bashrc in your home directory. On a Mac it may be called .bash_profile.

If your environment variable CLAW is properly set, the command

ls $CLAW

should list the top level directory, and report for example:       riemann/        pyclaw/
amrclaw/        clawutil/
geoclaw/        visclaw/        classic/


If you used pip to install Clawpack then you should not set this environment variable. But if you installed without pip, e.g. following Options for installing Clawpack Fortran codes, then you need to set PYTHONPATH to include the directory $CLAW. If PYTHONPATH is already set, then you may want to insert $CLAW into the list of directories searched by Python via:


See Python path for more information.