Pie (donut) chart segment order in D3

In d3 V4 this is also valid syntax (without the .layout):

d3.pie()
  .value(function(d) { return d.value; })
  .sort(null)

d3 automatically sorts by value for pie charts. Luckily, disabling sorting is quite easy, just use the sort(null) method on thedonut function, i.e.:

var donut = d3.layout.pie().value(function(d){
    return d.itemValue;
}).sort(null);

Here's a fiddle.