230913.012009.HKT revise README for #53

README.md

@@ -214,7 +214,9 @@ cmake --build build --target install
 ```
 This should create the `primaf` library for Fortran usage, located in the `install/lib/` directory
 to be used with the module files in `install/include/prima/mod/`.
-
+In case CMake fails to find your Fortran compiler,
+you can indicate it by specifying `-DCMAKE_Fortran_COMPILER=/path/to/your/Fortran/compiler`.
+Similarly, set `-DCMAKE_C_COMPILER=/path/to/your/Fortran/compiler` for your C compiler if needed.
 
 Examples on how to use the library from an external code are available in [`fortran/examples/`](https://github.com/libprima/prima/tree/main/fortran/examples).
 Below is an illustration with COBYLA.