There's been a change in the licensing regime for GNU Smalltalk: it's all GPL now, with some additional modifications that allow inter-mixing of LGPL code (Smalltalk or otherwise) linked in at the image level - here's the relevant section of the post (but read the whole thing: there are lots of details):

In principle, the GPL would not extend to Smalltalk programs, since these are merely input data for the virtual machine. On the other hand, using bindings that are under the GPL via dynamic linking would constitute combining two parts (the Smalltalk program and the bindings) into one program. Therefore, we added a special exception to the GPL in order to avoid gray areas that could adversely hit both the project and its users:

Linking GNU Smalltalk statically or dynamically with other modules is making a combined work based on GNU Smalltalk. Thus, the terms and conditions of the GNU General Public License cover the whole combination.

In addition, as a special exception, the Free Software Foundation give you permission to combine GNU Smalltalk with free software programs or libraries that are released under the GNU LGPL and with independent programs running under the GNU Smalltalk virtual machine.

There are some follow on questions and clarifications in the ensuing thread, which I'd also suggest reading if this is of interest to you.

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