Fix deps for Python 2.7/Ubuntu. Fixes #119.

Author: kislyuk

README.rst

@@ -33,28 +33,26 @@ Note: SignXML depends on `lxml <https://github.com/lxml/lxml>`_ and `cryptograph
 <https://github.com/pyca/cryptography>`_, which in turn depend on `OpenSSL <https://www.openssl.org/>`_, `LibXML
 <http://xmlsoft.org/>`_, and Python tools to interface with them. You can install those as follows:
 
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| OS           | Python  | Command                                                                                         |
-+==============+=========+=================================================================================================+
-| Ubuntu 16.04,| Python 2| ``apt-get install python-dev python-cffi libxml2-dev libxslt1-dev libssl-dev``                  |
-| 18.04        |         | ``python-lxml python-cryptography python-openssl python-certifi python-defusedxml``             |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| Ubuntu 16.04,| Python 3| ``apt-get install python3-dev python3-cffi libxml2-dev libxslt1-dev libssl-dev``                |
-| 18.04        |         | ``python3-lxml python3-cryptography python3-openssl python3-certifi python3-defusedxml``        |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| Ubuntu 14.04 | Python 2| ``apt-get install python-dev python-cffi libxml2-dev libxslt1-dev libssl-dev``                  |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| Ubuntu 14.04 | Python 3| ``apt-get install python3-dev python3-cffi libxml2-dev libxslt1-dev libssl-dev``                |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| Ubuntu 12.04 | Python 2| ``apt-get install python-dev libxml2-dev libxslt1-dev libssl-dev; pip install cffi``            |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| Red Hat      | Python 2| ``yum install python-devel python-cffi libxml2-devel libxslt1-devel openssl-devel``             |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| Red Hat      | Python 3| ``yum install python3-devel python3-cffi libxml2-devel libxslt1-devel openssl-devel``           |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
-| OS X/Homebrew|         | ``xcode-select --install; brew install openssl;``                                               |
-|              |         | ``export LDFLAGS="-L$(brew --prefix openssl)/lib" CFLAGS="-I$(brew --prefix openssl)/include"`` |
-+--------------+---------+-------------------------------------------------------------------------------------------------+
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| OS           | Python  | Command                                                                                                     |
++==============+=========+=============================================================================================================+
+| Ubuntu 16.04,| Python 2| ``apt-get install python-dev python-cffi libxml2-dev libxslt1-dev libssl-dev libffi-dev``                   |
+| 18.04        |         | ``python-lxml python-cryptography python-openssl python-certifi python-defusedxml build-essential``         |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| Ubuntu 16.04,| Python 3| ``apt-get install python3-dev python3-cffi libxml2-dev libxslt1-dev libssl-dev libffi-dev``                 |
+| 18.04        |         | ``python3-lxml python3-cryptography python3-openssl python3-certifi python3-defusedxml build-essential``    |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| Ubuntu 14.04 | Python 2| ``apt-get install python-dev python-cffi libxml2-dev libxslt1-dev libssl-dev libffi-dev build-essential``   |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| Ubuntu 14.04 | Python 3| ``apt-get install python3-dev python3-cffi libxml2-dev libxslt1-dev libssl-dev libffi-dev build-essential`` |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| Red Hat      | Python 2| ``yum install python-devel python-cffi libxml2-devel libxslt1-devel openssl-devel``                         |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| Red Hat      | Python 3| ``yum install python3-devel python3-cffi libxml2-devel libxslt1-devel openssl-devel``                       |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
+| OS X/Homebrew|         | ``xcode-select --install; brew install openssl;``                                                           |
+|              |         | ``export LDFLAGS="-L$(brew --prefix openssl)/lib" CFLAGS="-I$(brew --prefix openssl)/include"``             |
++--------------+---------+-------------------------------------------------------------------------------------------------------------+
 
 Synopsis
 --------

setup.py

@@ -21,7 +21,10 @@
         'certifi >= 2015.11.20.1'
     ],
     extras_require={
-        ':python_version == "2.7"': ['enum34 >= 1.0.4']
+        ':python_version == "2.7"': [
+            'enum34 >= 1.0.4',
+            'ipaddress >= 1.0.19, < 2'
+        ]
     },
     packages=find_packages(exclude=['test']),
     platforms=['MacOS X', 'Posix'],