Mention C++11 in docs

See also #31

Author: dahlia

README.rst

@@ -40,6 +40,12 @@ It's available on PyPI_, so you can install it using ``pip`` (or
 
    $ pip install libsass
 
+.. note::
+
+   libsass-python (and libsass) requires C++11 to compile.
+   It means you need install GCC (G++) 4.8+, LLVM Clang 3.3+,
+   or Visual Studio 2013+.
+
 Every release of libsass-python uses the most recent release of Libsass_.
 If you want bleeding edge features of libsass master, try installing
 libsass-unstable_ package instead:

docs/changes.rst

@@ -12,6 +12,10 @@ Version 0.6.0
 
 Released on October 27, 2014.
 
+Note that since libsass-python 0.6.0 (and libsass 3.0) it requires C++11
+to compile.  It means you need GCC (G++) 4.8+, LLVM Clang 3.3+, or
+Visual Studio 2013+.
+
 - Follow up the libsass upstream: :commit:`3.0` --- See the `release note`__
   of Libsass.