[package] pybind11/2.6.1: CMake warning and error emitted for test_package example

Hi, I have a directory containing all of the files from the pybind11/2.6.1 test package (minus the conanfile.py) and the following conanfile.txt:

[requires]                                                                      
pybind11/2.6.1                                                                  
                                                                                
[generators]                                                                    
cmake 

I expected that I would be able to execute the following commands:

• conan install . --build missing
• cmake .
• make

However, I observe the following output from CMake:

-- The CXX compiler identification is GNU 9.3.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/g++-9 - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Conan: Adjusting output directories
-- Conan: Using cmake global configuration
-- Conan: Adjusting default RPATHs Conan policies
-- Conan: Adjusting language standard
-- Current conanbuildinfo.cmake directory: /home/dchapp/repos/conan-center-index/recipes/pybind11/all/test
-- Conan: Compiler GCC>=5, checking major version 9.3
-- Conan: Checking correct version: 9.3
-- Found PythonInterp: /usr/bin/python (found version "2.7.17") 
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython2.7.so
CMake Warning at /home/dchapp/.conan/data/pybind11/2.6.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib/cmake/pybind11/pybind11Tools.cmake:17 (message):
  Set PYBIND11_PYTHON_VERSION to search for a specific version, not
  PYTHON_VERSION (which is an output).  Assuming that is what you meant to do
  and continuing anyway.
Call Stack (most recent call first):
  /home/dchapp/.conan/data/pybind11/2.6.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib/cmake/pybind11/pybind11Common.cmake:201 (include)
  /home/dchapp/.conan/data/pybind11/2.6.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib/cmake/pybind11/pybind11Install.cmake:249 (include)
  conanbuildinfo.cmake:781 (include)
  conanbuildinfo.cmake:259 (conan_include_build_modules)
  CMakeLists.txt:5 (conan_basic_setup)


-- Performing Test HAS_FLTO
-- Performing Test HAS_FLTO - Success
-- Found pybind11: /home/dchapp/.conan/data/pybind11/2.6.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include (found version "" )
CMake Error at CMakeLists.txt:7 (find_package):
  By not providing "Findpybind11.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "pybind11",
  but CMake did not find one.

  Could not find a package configuration file provided by "pybind11" with any
  of the following names:

    pybind11Config.cmake
    pybind11-config.cmake

  Add the installation prefix of "pybind11" to CMAKE_PREFIX_PATH or set
  "pybind11_DIR" to a directory containing one of the above files.  If
  "pybind11" provides a separate development package or SDK, be sure it has
  been installed.


-- Configuring incomplete, errors occurred!
See also "/home/dchapp/repos/conan-center-index/recipes/pybind11/all/test/CMakeFiles/CMakeOutput.log".

If I use the deprecated(?) conan package pybind11/2.3.0@conan/stable I do not observe this error. At this point I am unsure whether this is a problem with how I’m using conan or how the package is defined. Any assistance would be welcome.

Package and Environment Details (include every applicable attribute)

• Package Name/Version: pybind11/2.6.1
• Operating System+version: Linux Ubuntu 18.04
• Compiler+version: GCC 9.3
• Conan version: conan 1.31.0
• Python version: Python 3.6.9

Conan profile (output of conan profile show default or conan profile show <profile> if custom profile is in use)

Configuration for profile default:

[settings]
os=Linux
os_build=Linux
arch=x86_64
arch_build=x86_64
compiler=gcc
compiler.version=9.3
compiler.libcxx=libstdc++11
build_type=Release
[options]
[build_requires]
[env]
CC=/usr/bin/gcc-9
CXX=/usr/bin/g++-9

[danimtb]

Should be working fine after #4445 got merged

[prince-chrismc]

We are aware, Conan still official supports older versions so we have not changed it =)

Again, you most likely do have your project setup correctly, I’d encourage you to try the slack channel there a lot of helpful community members. You can also open an issue and we’ll do our best to get to it.