Unicode Problem

[Robert Simmons]

I'm having a unicode problem on FreeBSD lang/python34 that does not
appear on MacOS X. I've condensed the problem to one single line to
enter in the interpreter:

FreeBSD:
Python 3.4.2 (default, Jan 28 2015, 22:23:57)
[GCC 4.2.1 Compatible FreeBSD Clang 3.4.1 (tags/RELEASE_34/dot1-final
208032)] on freebsd10
Type "help", "copyright", "credits" or "license" for more information.
>>> b'\xc3\xa2'.decode('utf-8')
'\xe2'

MacOS X:
Python 3.4.2 (default, Oct 19 2014, 17:55:38)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.54)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> b'\xc3\xa2'.decode('utf-8')
'â'

Why is Python on FreeBSD incorrectly decoding this?