setup.py

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

extra_compile_args = [
    "-std=c++11", ## Compile C++11 code
    ## Add include directories
    "-I/usr/include",
    "-I./source",
    # "-I{0}".format(numpy.get_include()),
    "-flto",
    "-D_GLIBCXX_USE_CXX11_ABI=0" # Cython/GCC5 issues
    ## Link-time optimization
]

extra_link_args = [
    "-std=c++11", ## Link C++11 code
    # "-L/usr/local/Cellar/gsl/2.3/lib",
    "-L./source",
    "-lgsl",
    "-lgslcblas",
    "-lm"
]

setup(ext_modules = cythonize(Extension(
           "pytraffic",                                # the extension name
           sources=["pytraffic.pyx", "source/vehicles.cpp", "source/parameters.cpp", "source/road.cpp"], # the Cython source and
                                                  # additional C++ source files
           language="c++",                        # generate and compile C++ code
           extra_compile_args=extra_compile_args,
            extra_link_args=extra_link_args
      )))