python: another conflict on API version between pypi & v3 branch

bindings/python/setup.py

@@ -14,6 +14,7 @@ from distutils.core import setup
 VERSION = '3.0'
 SYSTEM = platform.system().lower()
 
+
 class LazyList(list):
     """A list which re-evaluates each time.
 
@@ -103,6 +104,10 @@ class custom_build_clib(build_clib):
 
             log.info("building '%s' library", lib_name)
 
+            # Darwin systems must produce shared libraries with this extension.
+            if "darwin" in SYSTEM:
+                self.compiler.shared_lib_extension = ".dynlib"
+
             # First, compile the source code to object files in the
             # library directory.
             macros = build_info.get('macros')