[Белый шум]

Попробуйте как-то так:

function setBuild (destUrl, newest) {
  processBuild(...)
    .pipe(processBuild(...))
    .pipe(processBuild(...))
    .pipe(processBuild(...))
    .pipe(processBuild(...))

  return src('./');
}

function processBuild (...) {
  var $d = $.Deferred();
  src(srcUrl)
    .pipe(gulpif(newest, changed(path.tmp.temp + baseUrl)))
    .pipe(dest(destUrl + baseUrl)
    .pipe( function(){ console.log(srcUrl); $d.resolve(); } )

  return $d;
}