Merge #3369

3369: Made instructions for macOS more clear r=grovesNL a=KaareZ Without the additional steps, an error like `error: failed to run custom build command for `gfx-backend-metal v0.3.3`` may occur. Tested on a fresh install of macOS 10.15.6 Additional steps copied from comment: #2309 (comment) Co-authored-by: Kaare Hansen <[email protected]>
gfx-rs · Sep 7, 2020 · c427128 · c427128
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 ## macOS Dependencies
 
-Install the newest XCode from the App Store. This installs the required `metal` developer tools.
+1. Install the newest XCode from the App Store. This installs the required `metal` developer tools.
+2. Install the command line tools with `xcode-select --install`. This might do nothing on your machine.
+3. If `xcode-select --print-path` prints `/Library/Developer/CommandLineTools…`
+4. then run `sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer`.
 
 To run the examples, ensure [CMake is installed](https://cmake.org/install/) as it is required for `glsl-to-spirv`.