Did you give the download section a look in the ADC portal or in XCode's preferences by any chance or did you just ask the question before looking ?
Sorry, I should have elaborated...
I did check the Preferences Download tab. And I searched not only the ADC portal but did an extensive internet search if there were any packages available. I did not find anything. (except threads that complained about the autotools being dropped out of XCode)
Still, I searched for solutions to the "missing gcc" error (that this thread already solved) for quite a while before I noticed the "command line tools" package, simply because I searched for the wrong words and did not know there was a package by that name.
If you are implying that there is a very simple solution that I just overlooked, please enlighten me.
Background to what I've been using so far: I worked on an older laptop that I upgraded through several XCode versions, that's why even with the newest, I still had a working MPI compiler and autotools on the system. But my laptop crashed and burned and I decided to start freshly with the new one, installing a plain XCode 4.3. That's when my troubles began.
I did have Macports installed for some more GNU utilities, but would like to avoid it for most parts, since upgrades take forever when you base everything on the Macports gcc (Compiling a compiler takes time...).
Maybe someone had a similar problem, and I've had very good experiences in the MacRumors forums (mostly in the Digital Video section).