Improve experience for those using Apple M1 devices #2460

- For Rosetta x64, prevent use of global ARM64 libvips
- For ARM64, improve error message when global libvips not found

docs/install.md

@@ -60,7 +60,13 @@ Check the output of running `npm install --verbose sharp` for useful error messa
 
 ## Apple M1
 
-libvips must currently be installed via Homebrew before installing sharp.
+If you are using ARM64 Node.js, which can be checked using:
+
+```sh
+node -p "process.arch === 'arm64'"
+```
+
+then libvips must currently be installed via Homebrew before installing sharp.
 
 ```sh
 brew install vips