Clang build of 3.4 release fails

I was able to download the source for the clang and llvm 3.4. I am able to install llvm, but when I try to install clang using the following:

…/cmake- …/clang -G"Unix Makefiles" -DCMAKE_BUILD_TYPE=release -DCMAKE_INSTALL_PREFIX=~/clangInstallDir/ -DCLANG_PATH_TO_LLVM_BUILD=~/llvmInstallDir/

It runs, and then right after the “Found subversion” line, it just hangs.

Any ideas?