First, install LLVM and clang (LLVM's C/C++/ObjC frontend). The clang libraries are used to generate C++ AST and to perform template instantiation. I recommend always using the trunk version of both LLVM and clang (they are kept in sync and I'll try to keep cpp2sir in sync as well). I will also keep this file updated with the revisions of LLVM and clang that are known to work.
$ svn co http://llvm.org/svn/llvm-project/llvm/tags/RELEASE_29/final llvm
$ svn co http://llvm.org/svn/llvm-project/cfe/tags/RELEASE_29/final llvm/tools/clang
Use cmake to generate whatever makefiles you use on your platform.
I recommend performing the build in a nested directory so as to keep the source
directories clean.
$ mkdir build
$ cd build
$ cmake .. -DCMAKE_INSTALL_PREFIX=<prefix>
After you run cmake, use the generated makefiles to build and install the libraries.
Once the installation is complete, you can configure and build cpp2sir.
$ cmake .. -DLLVM_INCLUDE_DIR=<llvm-include> -DLLVM_LIB_DIR=<llvm-lib>
If you can't get the sources to compile, please, let me know.