Pybind with cmake

[MrNeither]

Hi! Im trying to use pybind11
i have a ex.cpp

#include "pybind11/pybind11.h"
#include <iostream>
namespace py = pybind11;
class Test{
    int a;
    Test(int a){
        a=a;
    }
    void test(){
        std::cout<<" HELLO WORLD  "<< a <<std::endl;
    }
}

PYBIND11_MODULE(touch, m)
{
    pybind11::class_<Test>(m, "pytouch")
        .def(pybind11::init<int>())
        .def("test", &Test::test)
}

and cmakelist

cmake_minimum_required(VERSION 3.4)
project(test_project)
message("$CMake version: ${CMAKE_VERSION}")

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_subdirectory(pybind11)
pybind11_add_module(touch ${CMAKE_CURRENT_LIST_DIR}/ex.cpp)

but when i run

cmake -B build

i get error

-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
$CMake version: 3.16.3
-- pybind11 v2.10.0 dev1
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.8.10", minimum required is "3.6") 
-- Found PythonLibs: python3.8
-- Performing Test HAS_FLTO
-- Performing Test HAS_FLTO - Success
-- Configuring done
CMake Error in CMakeLists.txt:
  Imported target "pybind11::module" includes non-existent path

    "/usr/include/python3.8"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.



CMake Error in CMakeLists.txt:
  Imported target "pybind11::module" includes non-existent path

    "/usr/include/python3.8"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.



-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.

I'm using wsl2, could this be a problem? Pybind finds the correct path to python, but for some reason an error on the path that does not exist (it really does not exist)
I will be grateful for any help in this matter. Thx a lot!

[henryiii]

I think you are missing the development libraries for Python. You need to install the -dev or -devel package of Python.

[MrNeither]

Yes, that's worked! Thank you so much