To compile the example, compile the "reflexpr" fork of Clang by following the instructions on Matúš's website. Then pass REFLEXPR_PATH to CMake for this project.
mkdir build
cd build
cmake .. -DREFLEXPR_PATH=<path to the reflexpr fork>/reflection -DCMAKE_CXX_COMPILER=<reflexpr clang executable>
make
Compile Andrew Sutton's clang-reflect fork and pass CPP3K_PATH to CMake for this project.
mkdir build
cd build
cmake .. -DCPP3K_PATH=<path to the cpp3k fork>/tools/libcpp3k/include -DCMAKE_CXX_COMPILER=<clang-reflect executable>
make