I'm trying to build LLVM & Clang from sources on SL7. I have installed ocaml, but I still get the following two errors when running ../llvm/configure configure: WARNING: --enable-bindings=ocaml specified, but ctypes is not installed configure: WARNING: --enable-bindings=ocaml specified, but OUnit 2 is not installed. Tests will not run I can't seem to find anything on how to correct these errors. One recommendation for the 'types' error was to run opam, but opam is not in the SL7 or EL distros. I can't find anything on OUnit 2. Thank you for your assistance.