I can't get the same result when I build FORMS App

I pulled the FORMS app from GitHub, named it "IdeaForm", built an add-on wrapper around it and load it onto the Jive Sandbox. All that works well.

Next, I tried to build it locally with no changes and load it onto the Jive Sandbox and it didn't work. I noticed that the problem is with the "compile-soy" target. That target compiles the soy file in the template directory and create .js file in /target/soy. The /target/soy/fbldr.js file that came down from GitHub shows this (line 9):

jive.fbldr.soy.attachments = function(opt_data, opt_sb) {
  var output = opt_sb || new soy.StringBuilder();
  output.append('<div class="fbldr-attachments"><div class="fbldr-attach-head"><p>Use the following form to upload file attachments and, optionally, include a variable to reference the uploaded file in the form\'s HTML source.</p><p>Multiple files may be attached, but only one at a time.  Click "Finished" when all files have been attached.</p></div><div class="fbldr-attach-field"><label>Link to HTML Variable (optional) : </label></div><div class="fbldr-attach-field"><select id="fbldr-attach-link"><option value="" selected="selected">Select HTML variable...</option>');
  var optionList34 = opt_data.variables;
  var optionListLen34 = optionList34.length;
  for (var optionIndex34 = 0; optionIndex34 < optionListLen34; optionIndex34++) {
    var optionData34 = optionList34[optionIndex34];
    output.append('<option value="', soy.$$escapeHtml(optionData34), '">', soy.$$escapeHtml(optionData34), '</option>');
  }

The /target/soy/fbldr.js file I got after running "compile-soy" shows:

jive.fbldr.soy.attachments = function(opt_data, opt_ignored) {
  var output = '<div class="fbldr-attachments"><div class="fbldr-attach-head"><p>Use the following form to upload file attachments and, optionally, include a variable to reference the uploaded file in the form\'s HTML source.</p><p>Multiple files may be attached, but only one at a time.  Click "Finished" when all files have been attached.</p></div><div class="fbldr-attach-field"><label>Link to HTML Variable (optional) : </label></div><div class="fbldr-attach-field"><select id="fbldr-attach-link"><option value="" selected="selected">Select HTML variable...</option>';
  var optionList34 = opt_data.variables;
  var optionListLen34 = optionList34.length;
  for (var optionIndex34 = 0; optionIndex34 < optionListLen34; optionIndex34++) {
    var optionData34 = optionList34[optionIndex34];
    output += '<option value="' + soy.$$escapeHtml(optionData34) + '">' + soy.$$escapeHtml(optionData34) + '</option>';
  }

Notice the second parameter of the function is opt_sb vs opt_ignored. The next line of code (var output) is completely different. I suspect there are other differences. What I don't understand is why. "compile-soy" depends on SoyToJsSrcCompiler.jar, is there a specific version of the jar I need?

With the files I built locally, the add-on loaded fine but the form UI is blank.