Compilation of the simple pybind example fails on macos

Question

I'm trying to implement the simple add function example in the pybind11 docs. I'm using the default mac python3 (3.7.7), and have installed pybind11 by pip3 install pybind11.

There is an example.cpp file:

#include <pybind11/pybind11.h>


int add(int i, int j)
{
        return i + j;
}

PYBIND11_MODULE(example, m)
{
        m.doc() = "pybind11 example plugin"; //optional module docstring
        m.def("add", &add, "A function which adds two numbers");
}

I'm trying to compile this using the default command they give for macos:

c++ -O3 -Wall -shared -std=c++11 -undefined dynamic_lookup `python3 -m pybind11 --includes` example.cpp -o example`python3-config --extension-suffix`

This results in a series of errors, however:

clang: error: unsupported option '--extension-suffix`'
clang: error: unknown argument: '-m'
clang: error: no such file or directory: '`python3'
clang: error: no such file or directory: 'pybind11'

What am I missing? Did I miss a step setting up pybind11?

Answer 1

It turns out that I had to add pybind11 to my path separately:

export PYTHONPATH=$PYTHONPATH:/usr/local/include/python3.7m/pybind11/