navit fails to build in python bindings (*_getattr_py)

[l29ah]

Trying to build 329c6a2 (trunk HEAD) on Gentoo Lignux. Observing lots of errors like:

/var/tmp/portage/sci-geosciences/navit-9999-r1/work/navit-9999/navit/binding/python/navigation.c: In function ‘navigation_getattr_py’:
/var/tmp/portage/sci-geosciences/navit-9999-r1/work/navit-9999/navit/binding/python/navigation.c:43:12: error: implicit declaration of function ‘Py_FindMethod’ [-Wimplicit-function-declaration]
   43 |     return Py_FindMethod(navigation_methods, self, name);
      |            ^~~~~~~~~~~~~
/var/tmp/portage/sci-geosciences/navit-9999-r1/work/navit-9999/navit/binding/python/navigation.c:43:12: error: returning ‘int’ from a function with return type ‘PyObject *’ {aka ‘struct _object *’} makes pointer from integer without a cast [-Wint-conversion]
   43 |     return Py_FindMethod(navigation_methods, self, name);
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Not sure if relevant, cmake says:

CMake Warning (dev) at CMakeLists.txt:239 (find_package):
  Policy CMP0148 is not set: The FindPythonInterp and FindPythonLibs modules
  are removed.  Run "cmake --help-policy CMP0148" for policy details.  Use
  the cmake_policy command to set the policy and suppress this warning.

This warning is for project developers.  Use -Wno-dev to suppress it.

$ python2 --version
Python 2.7.18
$ python3 --version
Python 3.12.8
$ cmake --version
cmake version 3.31.4

CMake suite maintained and supported by Kitware (kitware.com/cmake).

[jkoan]

Please try #1266 aka the fix_python2_build branch

[l29ah]

Tried it, the result is:

In file included from /var/tmp/portage/sci-geosciences/navit-9999-r1/work/navit-9999/navit/binding/python/pcoord.c:20:
/var/tmp/portage/sci-geosciences/navit-9999-r1/work/navit-9999/navit/binding/python/common.h:20:10: fatal error: Python.h: No such file or directory
   20 | #include <Python.h>
      |          ^~~~~~~~~~