Install humble from source: Problem rclpy and pybind11

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Hello ROS-Community, I tried to install ROS 2 Humble from source on Ubuntu 20.04. I did it like described in this instruction: docs.ros.org

Everything worked fine until I tried to build the code

colcon build --symlink-install

It installed over 150 pkgs and then it failed at rclpy with this error:

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

    "/include"

  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::embed" includes non-existent path

    "/include"

  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 Generate step failed.  Build files cannot be regenerated correctly.
---

What did I do wrong? Thank you for your help.