Question

I’ve just found out, that my homebrew doesn’t work anymore after I upgraded to OS X Lion.

$ brew install clojure
Warning: Xcode is not installed! Builds may fail!
Error: No such file or directory - /usr/bin/cc

and

$ brew doctor
We couldn't detect gcc 4.2.x. Some formulae require this compiler.

We couldn't detect gcc 4.0.x. Some formulae require this compiler.

You have no /usr/bin/cc. This will cause numerous build issues. Please
reinstall Xcode.
Setting DYLD_LIBRARY_PATH can break dynamic linking.
You should probably unset it.

after some googling, I found out that I should upgrade Xcode to version 4.1. The problem is, I have version 3.2.5 installed and I can’t find any way of uninstalling it.

When I look at App Store, it looks like I don’t have Xcode installed at all. I’m afraid that if I install it via App Store, it will somehow conflict with the version I have currently installed. However I can’t find it in Applications, and I can’t find any update function either.

Software Update doesn’t prompt me to update Xcode, and I also don’t see it in Installed Software.

What should I do?

Answer 1

Thanks to the readme found at /Developer, I found a way to uninstall Xcode via

$ sudo /Developer/Library/uninstall-devtools --mode=all

edit: I just ran the installer for Xcode 4, and it detected old version of Xcode, offering me to move it to /Developer-old.