-dnspython>=1.11
+dnspython>=1.11,<1.16.0
nose>=1.3.7
libnacl>=1.4.3
requests>=2.1.0
+protobuf>=2.5,<3.0; sys_platform != 'darwin' and sys_platform != 'openbsd6'
+protobuf>=3.0; sys_platform == 'darwin' or sys_platform == 'openbsd6'
+pysnmp>=4.3.4
+future>=0.17.1