Fortran is required to both run the executables and to compile the source code. If you do not have a fortran compiler installed you can download one here: https://gcc.gnu.org/wiki/GFortranBinaries. To run one of the models, place the executable (adaptive_dynamics, ecology_bottomup, or ecology_topdown) and the parameter file (parameter.dat) in the same directory and run the executable. You may need to make the model files executable (e.g., chmod +x adaptive_dynamics). There is no need to recompile the model after changing directories or after changing any of the parameters. You can also use the small bash script run_model.sh to run any of the models. e.g., ./run_model "test_output" "adaptive_dynamics" will run the adaptive dynamics model in the folder test_output. If the folder doesn't exist it will create the folder. If a parameters, stating population, or seed file is present the model will run with those. If there is not a parameters file in the directory, the script will copy the one present in the source code folder to the output folder. Because the models will use present parameters and starting population files, you can run multiple models in the same directory. If you want to compile the model from source, you need to compile with the math functions, the model functions, and the ode solver (rkf45.f90) files as well as the flags for lapack and blas. e.,g., gfortran -O3 -ftree-vectorize -llapack -lblas my_math_functions.f90 model_functions.f90 rkf45.f90 adaptive_dynamics.f90 -o adaptive_dynamics