When compiling the source code for Delft3D 2023.02, I guess that the difference between the running from the root directory and is that the former compiles Delft3D-FM while the second one compiles Delft3D4. Could someone confirm?

So far the compilation using has not worked for me. I could do with Delft3D4 however, and the compilation using does not throw any error and is capable of running the examples.

If anyone could explain the difference between the two configurations and what limitations will the delft3d4 have I will be very thankful.