Xcode, GCC, and Homebrew
Unfortunately Apple's new Command Line Tools for Xcode doesn't include regular gcc, but Apple's gcc-compatible wrapper around LLVM (i.e. /usr/bin/gcc is a symlink that points to llvm-gcc).llvm-gcc doesn't compile many projects correctly, including gcc itself (as of Xcode 4.2 there were reports that it's not possible to compile a gcc cross-compiler using llvm-gcc). Hopefully there have been improvements in this regard.Still, anyone who needs the real gcc will have to install it through some other means.