How to generate LLVM IR code to call C++ STL function?

Question

I want to generate LLVM-IR that contains a call to a C++ STL function. e.g. std::sort(). I think I need to go through following steps to achieve the task.

1. Link std::sort() into the IR
2. Get a reference to function std::sort()
3. Create a call to std::sort() using IRBuilder.CreateCall(~).

I'm not sure how to achieve the first step above.