Update 1- Installation.md

farm-ng-core troubleshooting for mac users

Author: eranario

docs/1. App/1- Installation.md

@@ -91,4 +91,5 @@ npm run server
 ## Troubleshooting
 - If the path in `package.json` is not properly populated, a `Failed to upload file` error will appear. Make sure the path points to an existing and accessible directory. This error will also be seen if the Flask Server fails to start.
 - To ensure that the app is properly running in Docker, after the command `npm start gemini`, ensure that the terminal is NOT cleared (meaning you should be able to scroll up and see previous commands). If the terminal is cleared (you are unable to scroll up to view previous commands), the app is not running in Docker properly. Restart Docker and try again. 
-- Certain errors during orthophoto generation can be solved by manual deletion of the `~/GEMINI-App-Data/temp` directory. If generation is repeatedly failing, delete `temp` before the next attempt.
+- Certain errors during orthophoto generation can be solved by manual deletion of the `~/GEMINI-App-Data/temp` directory. If generation is repeatedly failing, delete `temp` before the next attempt.
+- If you encounter an error during installation of `farm-ng-core` such as `error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]`, it means the compiler is treating warnings as errors due to the `-Werror` flag. To resolve this, open the `setup.py` file inside the `farm-ng-core` directory and remove the `"-Werror"` entry from the `extra_compile_args` list. This will allow the build to proceed even when compiler warnings are present. (Common for MacOS users)