fix setup.py regarding pathlib

setup.py

 #!/usr/bin/env python
 
 import os
+import sys
 
 from setuptools import setup
 
@@ -11,6 +12,9 @@ name = 'rubygemsrecipe'
 def read(*rnames):
     return open(os.path.join(os.path.dirname(__file__), *rnames)).read()
 
+test_requires=['mock']
+if sys.version_info < (3,4):
+    test_requires.append('pathlib')
 
 setup(name=name,
       version=version,
@@ -30,10 +34,7 @@ setup(name=name,
           'slapos.recipe.build',
       ],
       extras_require={
-          'test': [
-              'mock',
-              'pathlib; python_version<"3.4"',
-          ],
+          'test': test_requires
       },
       entry_points={
           'zc.buildout': ['default = rubygems:Recipe']

[Jérome Perrin]

it's surprising that the previous syntax did not work, it looks the syntax was correct and it's usually supported, maybe not when installing extras. It's not so important, but we can try to revert this once we update buildout