How to properly build binder for pybind11

I'm a first user of binder and I followed the installation steps but when I run the last following command:

cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_EH=1 -DLLVM_ENABLE_RTTI=ON .. && ninja

It says: CMake Error: The source directory "/Users/cuinjune/prefix" does not appear to contain CMakeLists.txt.

Am I missing something? I followed the steps twice but still stuck at the last step. Any guidance would be appreciated.

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