setup.py - get rid of hardcoded paths

examples/ext/lib_test/setup.py

@@ -3,13 +3,18 @@
 # see LICENSE.txt
 from setuptools import setup, Extension
 
+import pybind11
+includes=[]
+includes.append('../../lib/lib_test')
+includes.append(pybind11.commands.get_include())
+
+
+
 ext_modules = [
     Extension(
         "lib_test",
         ["lib_test/lib_test.cc"],
-        include_dirs=['../../lib/lib_test',
-                      '/opt/local/Library/Frameworks/Python.framework/Versions/3.8/include/python3.8',
-                      'venv_lib_test/lib/python3.8/site-packages/pybind11/include'],
+        include_dirs=includes,
         extra_compile_args=['-std=c++11'],
         libraries=['lib_test'],
         library_dirs=['../../lib/lib_test/']