AX_PYTHON_DEVEL cross-compilation

Hello,

I'm using AX_PYTHON_DEVEL to setup the environment for building the
python bindings (C extensions) for a C library. It works fine until I
try to cross-compile it (either within Buildroot environment or using
the SDK generated by yocto).

The exact error I'm getting is:

configure: error:
  Could not link test program to Python. Maybe the main Python library has been
  installed in some non-standard library path. If so, pass it to configure,
  via the LIBS environment variable.
  Example: ./configure LIBS="-L/usr/non-standard-path/python/lib"
  ============================================================================
   ERROR!
   You probably have to install the development version of the Python package
   for your distribution.  The exact name of this package varies among them.
  ============================================================================

I'm seeing that in the yocto SDK libpython3.5m.so.1.0 exists both in
the target and host sysroots.

Any advice on what I'm doing wrong?

-- 
Best regards,
Bartosz Golaszewski