Fix dependencies in setup.py to work in EL7. (#559)

Environment markers don't work on older python versions (EL7).

2 files changed, 3 insertions, 2 deletions

diff --git a/setup.py b/setup.py
index c745b35..02c993e 100755
--- a/setup.py
+++ b/setup.py
@@ -24,8 +24,9 @@ setuptools.setup(
     author='Google Compute Engine Team',
     author_email='gc-team@google.com',
     description='Google Compute Engine',
+    extra_require={":python_version>='3.5'": ["distro"]},
     include_package_data=True,
-    install_requires=['boto', 'setuptools', 'distro;python_version>="3.5"'],
+    install_requires=['boto', 'setuptools'],
     license='Apache Software License',
     long_description='Google Compute Engine guest environment.',
     name='google-compute-engine',
diff --git a/tox.ini b/tox.ini
index 6d543ee..8b75d39 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ envlist = py26,py27,py32,py33,py34,py35,pypy,pypy3
 
 [testenv]
 deps =
-    py35: distro
+    py{35,36}: distro
     setuptools>=20
     pytest
     pytest-cov