Update README.md

jim-schwoebel · Aug 13, 2021 · 2ab3d1a · 2ab3d1a
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@@ -44,6 +44,11 @@ brew unlink python
 brew link bzip2
 ```
 
+Now install [Xcode](https://osxdaily.com/2014/02/12/install-command-line-tools-mac-os-x/) if you have not already:
+```
+sudo xcode-select --install
+```
+
 Edit some environment variables in .bash_profile:
 ```
 nano ~/.bash_profile