JSLint is probably suggesting a useful code architecture improvement for you here, actually. Why not put all of those globals in the same namespace?
Rather than...
var Global1 = "spam",
Global2 = 2;
... use...
var MyStuff = MyStuff || {};
MyStuff.Global1 = "spam";
MyStuff.Global2 = 2;
... or, more conventionally...
var MyStuff = {
Global1: "spam",
Global2: 2
};
... and now you can simply include...
/*global MyStuff*/
... on every [other] file and profit. If you add more items to MyStuff
later, you're already covered. And if you need to add something to MyStuff on the page that's treating it as a global, that's straightforward too... MyStuff.NewField = "new";
That you have lots of stuff moving from one file to another already suggests they're a functional unit (or several functional units) that each file needs to know about. JSLint is suggesting you group them as such.