Ledger 3.1 fails to build on OS X against Boost 1.59.0.
[ 70%] Building CXX object src/CMakeFiles/libledger.dir/py_commodity.cc.o
/tmp/ledger20150814-16604-u40p80/ledger-3.1/src/py_amount.cc:131:26: error: no matching function for call to 'make_setter'
make_setter(&amount_t::is_initialized))
^~~~~~~~~~~