Quickly, to compile naca456 use:
gfortran naca456.f90 -o naca456
From the same directory as the naca456 compiled program, you may wish to create a symbolic link, so naca456 can be called easily from any directory:
ln -s naca456 /home/$USER/bin/naca456
Then to run the program, specify the input file as a command line argument:
naca456 samples/4415_danny.nml
The program should run and produce 3 output files: *.dbg *.out *.gnu
There is a helper Matlab script that reads the relevant part of the naca456 output files, and can be used to create input files for various other programs, such as: xfoil mses openfoam starccm+
These programs above produce the Lift and Drag polars from the airfoil coordinates
Additionally, can write input files for: harp_opt co-blade