Loading Libraries in Dr Scheme

Question

I work through SICP using Dr Scheme.

How to load external libraries in Dr Scheme? Suppose I want to use a Math library, then how can I ask Dr Scheme about loading a specific library?

I tried the following: (require (lib "math.ss"))

The following error appeared: link to undefined identifier: require

I chose R5RS as the language.

Answer 1

Change the language to Pretty Big. 'require' is not R5RS .

Answer 2

Use this for r5rs:

(#%require (lib "math.ss"))

Answer 3

, R5RS, Pretty Big language. ?