Technique for Smaller QT Setups of C++ Apps

Technique for Smaller QT Setups of C++ Apps

I'm a little rusty on my C++ because I'm a PHP dev, and only messed around
with C/C++ in college, and C# on one project ten years ago. A C++
developer in my company is using the Qt library. He's saying that we're
going to need to put about 15MB of Qt library stuff in a setup.exe, which
seems a bit large to me.
Is there a way to change the Visual Studio C++ compiler settings so that
it only picks and chooses out of the Qt library that which it actually
uses, and its dependencies, and doesn't need to ship this large 15MB Qt
library stuff in the setup.exe?