Compiling is the act of turning the ADCIRC source code into an executable that can be run. ADCIRC is written in Fortran, so a Fortran compiler is needed, as a minimum. Several resources are available to help with the compiling process. The ADCIRC Developers Guide provides good basic instructions for compiling on a new system. Getting started contains further useful instructions. NC State's Coastal & Computational Hydraulics Team also gives instructions on how to compile SWAN+ADCIRC.