You have to install the new version of XCode. That should pull in all of the relevant development tools. They're not a part of the standard OSX install.
That's fair enough, and thanks for the tip. I think my larger point is that I don't like that they actively removed something that was working fine for me. If it was a fresh install I'd be fine with it, but upgrading a previous install shouldn't be equivalent to "uninstalling stuff randomly" to me.
It does that every OS upgrade. I think the reasoning is that that particular developer toolchain was tied to that OS. Now that you're using a new OS, you shouldn't use the old toolchain. This particularly mattered in the 10.5 to 10.6 upgrade, because they extended gcc to support "blocks," which were tied into the Grand Central Dispatch implementation in the kernel.
It would be nice if they automatically detected, "Oh, you have XCode installed, so you would probably like the new version, too."
