neither Debian/Ubuntu 1.63 packages nor CMake feature NumPy support (discussion, not a bug)

Excuse me for posting here as it is likely a packaging problem, yet I thought I could get some hints here before proceeding with a Debian bug report.

Trying to use the new NumPy support, I came up with the following partial hello world code which compiles, links but fails with an undefined symbol error at runtime:

*hello.cpp*:
```C++
#include

void init()
{
Py_Initialize();
boost::python::numpy::initialize();
}

BOOST_PYTHON_MODULE(hello)
{
}
```

*CMakeLists.txt*:
```CMake
project(hello CXX)
cmake_minimum_required(VERSION 3.7)

add_library(hello SHARED hello.cpp)
set_target_properties(hello PROPERTIES SUFFIX ".so") # e.g. Mac defaults to .dylib which is not looked for by Python

# informing the Python bindings where to find Python
find_package(PythonInterp REQUIRED)
find_package(PythonLibs ${PYTHON_VERSION_STRING} EXACT REQUIRED)
target_include_directories(hello PUBLIC ${PYTHON_INCLUDE_DIRS})
target_link_libraries(hello ${PYTHON_LIBRARIES})

# informing the Python bindings where to find Boost.Python
# NumPy support was introduced in 1.63
find_package(Boost 1.63 COMPONENTS python-py${PYTHON_VERSION_MAJOR}${PYTHON_VERSION_MINOR} QUIET REQUIRED)
target_link_libraries(hello ${Boost_LIBRARIES})
target_include_directories(hello PUBLIC ${Boost_INCLUDE_DIRS})
```

Here's what happens on a all-standard Ubuntu zesty installation with the Debian/Ubuntu 1.63 packages:

```
$ mkdir build
$ cd build/
$ cmake ..
-- The CXX compiler identification is GNU 4.9.2
-- 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
-- Found PythonInterp: /usr/bin/python (found version "2.7.13")
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython2.7.so (found suitable exact version "2.7.13")
CMake Warning at /usr/share/cmake-3.7/Modules/FindBoost.cmake:1534 (message):
No header defined for python-py27; skipping header check
Call Stack (most recent call first):
CMakeLists.txt:16 (find_package)

-- Configuring done
-- Generating done
-- Build files have been written to: /home/vagrant/temp/build
$ make
Scanning dependencies of target hello
[ 50%] Building CXX object CMakeFiles/hello.dir/hello.cpp.o
[100%] Linking CXX shared library libhello.so
[100%] Built target hello
$ python
Python 2.7.13 (default, Jan 19 2017, 14:48:08)
[GCC 6.3.0 20170118] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import libhello
Traceback (most recent call last):
File "", line 1, in
ImportError: ./libhello.so: undefined symbol: _ZN5boost6python5numpy10initializeEb
>>>
```

Also:
```
$ ldd libhello.so
linux-vdso.so.1 => (0x00007ffd301d5000)
libpython2.7.so.1.0 => /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 (0x00007f2c04b3b000)
libboost_python-py27.so.1.63.0 => /usr/lib/x86_64-linux-gnu/libboost_python-py27.so.1.63.0 (0x00007f2c048f2000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f2c0452b000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f2c0430d000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f2c040f2000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f2c03eec000)
libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007f2c03ce9000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f2c039e0000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f2c03658000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f2c03441000)
/lib64/ld-linux-x86-64.so.2 (0x00007f2c052de000)
```

```
$ ls -1 /usr/lib/x86_64-linux-gnu/libboost_python*
/usr/lib/x86_64-linux-gnu/libboost_python.a
/usr/lib/x86_64-linux-gnu/libboost_python-py27.a
/usr/lib/x86_64-linux-gnu/libboost_python-py27.so
/usr/lib/x86_64-linux-gnu/libboost_python-py27.so.1.63.0
/usr/lib/x86_64-linux-gnu/libboost_python-py35.a
/usr/lib/x86_64-linux-gnu/libboost_python-py35.so
/usr/lib/x86_64-linux-gnu/libboost_python-py35.so.1.63.0
/usr/lib/x86_64-linux-gnu/libboost_python.so
```

```
$ nm /usr/lib/x86_64-linux-gnu/libboost_python*.a | grep numpy | wc -l
0
```

Thanks in advance for any hints