Pin pyOpenSSL major version to 17.* for Python 2.6

See: https://github.com/pyca/pyopenssl/blob/74de8a137d435d45c100b74cc971be556166a559/CHANGELOG.rst#1800-2018-05-16

1 files changed, 7 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 3aa9ccf0..f4cafb7b 100755
--- a/setup.py
+++ b/setup.py
@@ -19,6 +19,12 @@ with codecs.open('CHANGES.rst', encoding='utf-8') as fp:
     changes = fp.read()
 version = VERSION
 
+# pyOpenSSL version 18.0.0 dropped support for Python 2.6
+if sys.version_info < (2, 7):
+    PYOPENSSL_VERSION += 'pyOpenSSL >= 0.14, < 18.0.0'
+else:
+    PYOPENSSL_VERSION = 'pyOpenSSL >= 0.14'
+
 setup(name='urllib3',
       version=version,
       description="HTTP library with thread-safe connection pooling, file post, and more.",
@@ -63,7 +69,7 @@ setup(name='urllib3',
       test_suite='test',
       extras_require={
           'secure': [
-              'pyOpenSSL>=0.14',
+              PYOPENSSL_VERSION,
               'cryptography>=1.3.4',
               'idna>=2.0.0',
               'certifi',