diff --git a/setup/extensions.py b/setup/extensions.py
index ccff4b6..d3a4693 100644
--- a/setup/extensions.py
+++ b/setup/extensions.py
@@ -429,6 +429,7 @@ class Build(Command):
                     makefile=mf, universal=OSX_SDK, qt=1)
             makefile.extra_lflags = qt_objects
             makefile.extra_include_dirs = ext.inc_dirs
+            makefile.LIBS.append('-lpython'+sysconfig.get_python_version())
             makefile.generate()
 
             self.check_call([make, '-f', mf], cwd=src_dir)