Installed the full XCODE (about 2 GB) in a brand new mavericks macbook, using App Store, then rebooted. Ran Xcode. Went to Preferences > Location, verified Command Line Tools shows up (v 5.0.2 5A3005).
In terminal, xcode-select -print-path shows /Applications/Xcode.app/Contents/Developer plus I can now run gcc --version and see version info.
So AFAIK command line tools are installed.
However, when I try to install homebrew, it opens the gui dialog offering to install XCode or the command line tools.
I don't want to end up double-installing, with conflicting paths, so any help on why the brew installer isn't "seeing" the commandline tools would be appreciated.