svn co http://llvm.org/svn/llvm-project/llvm/branches/release_30/ llvm30
cd llvm30
cd tools
svn co http://llvm.org/svn/llvm-project/cfe/branches/release_30/ clang
cd ..
./configure --enable-optimized --disable-doxygen --prefix=/llvm30
make -j 4
make install