How do I add pkg-config the setup.py of a Cython wrapper

Question

How can I add pkg-config to the following setup.py (for example if I want to add glib-2.0)

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize

wrapper = Extension(
    name="wrapper",
    sources=["wrapper.pyx"],
    libraries=["library"],
    library_dirs=["builddir/lib"],
    include_dirs=["lib"]
)
setup(
    name="wrapper",
    ext_modules=cythonize([wrapper])
)

I can do it as follows, but I don't want to use paths (/usr/lib/x86_64-linux-gnu/ and /usr/include/glib-2.0) and make it portable

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize

wrapper = Extension(
    name="wrapper",
    sources=["wrapper.pyx"],
    libraries=["library"],
    library_dirs=["builddir/lib", "/usr/lib/x86_64-linux-gnu/"],
    include_dirs=["lib", "/usr/include/glib-2.0"]
)
setup(
    name="wrapper",
    ext_modules=cythonize([wrapper])
)

Answer 1

Getting some inspiration from this recipe, I've used the following setup file to find the proper paths for GSL.

import subprocess

from setuptools import setup, Extension
from Cython.Build import cythonize


def pkgconfig(package, kw):
    flag_map = {'-I': 'include_dirs', '-L': 'library_dirs', '-l': 'libraries'}
    output = subprocess.getoutput(
        'pkg-config --cflags --libs {}'.format(package))
    for token in output.strip().split():
        kw.setdefault(flag_map.get(token[:2]), []).append(token[2:])
    return kw


example_src = ['src/example.c', 'example/example.pyx']
example_inc = ['include']
extension_kwargs = {
    'sources': example_src,
    'include_dirs': example_inc,
}

extension_kwargs = pkgconfig('gsl', extension_kwargs)

example_ext = Extension('example.example', **extension_kwargs)

setup(name="example",
      ext_modules=cythonize([example_ext], annotate=True),
      packages=['example']
      )

You could use the pkgconfig function to find the glib flags by passing glib-2.0 as the package argument.