i had problems with the command line tools as well after upgrading to mavericks, despite having updated xcode, and i am quite sure i also installed the command line tools. still, you can add them "by hand" downloading from apple site. i am not sure if it is any sort of bug of such, but anyway, i recommend you to download the latest mavericks' command line tools (late october) on apple's developer site (needs free registration)


on my system in terminal:


is linked to :

$ which llvm-gcc
/usr/bin/llvm-gcc is linked to /usr/bin/clang

note that apple no longer provides llvm-gcc as an option in xcode so perhaps it is no longer supplied as a command-line tool.

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