--- a/Python/setup.py
+++ b/Python/setup.py
@@ -244,8 +244,9 @@ class PyBuildExt(build_ext):
 
     def detect_modules(self):
         # Ensure that /usr/local is always used
-        add_dir_to_list(self.compiler.library_dirs, '/usr/local/lib')
-        add_dir_to_list(self.compiler.include_dirs, '/usr/local/include')
+        # On GNU/Linux /usr/local is always used, so we don't include it twice
+        #add_dir_to_list(self.compiler.library_dirs, '/usr/local/lib')
+        #add_dir_to_list(self.compiler.include_dirs, '/usr/local/include')
 
         # Add paths specified in the environment variables LDFLAGS and
         # CPPFLAGS for header and library files.