Minimal Lisp binaries

Nearly all lisp dialects have native code compilers, and many can produce standalone executables. One thing I don't understand however is why executables require the full run-time? especially when your code doesn't use eval. Is there a way to use create a minimal image with sbcl that only includes the functions your program uses?

It's because GC implementation takes so much space.

Also, if you could make it smaller, you couldn't make anything useful with it anyways, since the GC pauses execution in every critical moment.