joaomrbaltazar/PROPAN ? reverse-engineered prompt

Build me this PROPAN project so I can compile and run it on a normal Windows or Linux machine.

It looks like it’s a Fortran 95 code for potential flow around foils, propellers, turbines, and helicopter rotors, with a preprocessor and a postprocessor too. Please make sure the main code, the grid generator, and the results viewer or postprocessing parts all work together from the repo as it is, and use the examples to verify that everything runs end to end.

I want clear build and run instructions in the README, plus any fixes needed so a new user can get started without hunting around. If there are missing dependencies or old Fortran library issues, handle them as best you can and note what I need to install. Keep the output in the same style the project already uses, with the ASCII and Tecplot files it mentions. If you need to check current compiler or library docs online, go ahead.