Maybe you've seen this, but the GNU Smalltalk site has some
information on applying the licenses...

>From the FAQ...
========
"Does copyright restrict the use of GNU Smalltalk?

It does, but in general you don't need to worry much about the
licensing of your Smalltalk programs.

The class library is licensed under the GNU LGPL. Thus, it permits
using the library together with non-free programs.

The virtual machine and the bindings to external libraries are
licensed under the GNU GPL, with a special exception that allows
Smalltalk programs to be linked with the functions exported by the
virtual machine and said bindings."
========

And the user manual has quite a bit more information...

http://www.gnu.org/software/smalltalk/manual/gst.html#Legal-concerns