1 files changed, 9 insertions, 0 deletions
diff --git a/setup.py b/setup.py
index e1cc2394..a1305d2f 100644
--- a/setup.py
+++ b/setup.py
@@ -10,8 +10,11 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import sys
+
 from setuptools import setup, find_packages
 
+
 about = {}
 with open("cryptography/__about__.py") as fp:
     exec(fp.read(), about)
@@ -27,6 +30,12 @@ setup_requires = [
     CFFI_DEPENDENCY,
 ]
 
+install_requires = [
+    "cffi>=0.6",
+]
+
+if sys.version_info[:2] < (3, 4):
+    install_requires += ["enum34"]
 
 setup(
     name=about["__title__"],