Merge pull request #79 from cvanlabe/docupdate_macosx_libarchive

Add a section to the README about the compatibility with old versions of libarchive and particularly the ones shipped with MacOS. The `LIBARCHIVE` environment variable is now minimally documented.

Author: Changaco

README.rst

@@ -14,11 +14,21 @@ Installation
 Compatibility
 =============
 
+python
+------
+
 python-libarchive-c is currently tested with python 2.7, 3.4, 3.5, and 3.6.
 
 If you find an incompatibility with older versions you can send us a small patch,
 but we won't accept big changes.
 
+libarchive
+----------
+
+python-libarchive-c may not work properly with obsolete versions of libarchive such as the ones included in MacOS. In that case you can install a recent version of libarchive (e.g. with ``brew install libarchive`` on MacOS) and use the ``LIBARCHIVE`` environment variable to point python-libarchive-c to it::
+
+    export LIBARCHIVE=/usr/local/Cellar/libarchive/3.3.3/lib/libarchive.13.dylib
+
 Usage
 =====
 

setup.cfg

@@ -3,5 +3,5 @@ universal = 1
 
 [flake8]
 exclude=.?*,env*/
-ignore = E226,E731
+ignore = E226,E731,W504
 max-line-length = 80