Mobile App Development IOS

I'm trying to compile Fortran 90 code for iOS (arm64). That's not a project, I just need help. I need to compile a project that has C and Fortran code. The problem is Fortran, GFortran doesn't work for arm64. I tried with f2c, a translator that converts Fortran 77 code to C. It works, but I also have Fortran 90 sources. I also tried Flang ([login to view URL]) but it doesn't seem to be what I need. I tried DragonEgg ([login to view URL]). That seems to work, but it's not maintained anymore and I cannot get it work on my Mac with macOS Big Sur. So, what I would like is not the project compiled, but just the tools I need to compile Fortran 90 code for iOS, which is what I'm not able to do. So, if you need to compile a compiler for example, you could send me that. I searched a lot on the internet and I cannot find another solution than DragonEgg, but it's not maintained and I couldn't compile it. If you are able to compile DragonEgg, that would be great (I can install older versions of GCC and LLVM). But if you find another solution to compile Fortran code for iOS that would also be great. Thank you! Sorry for the weird request.