Classpath relying on non-free software

[Joseph C. Lesh]

Hey there, so here I am, happily trying to get everything hunky-dory,
fixing problems that indent created (the d thing) and other mistakes I
originally made. So I think I've got everything fixed but when I run 
make install it fails because I don't have unzip. Not a problem I say!
I'm a happy GNU Linux hacker and will get it!

< THE POINT ->I search more and find out that unzip is a 
non-free piece of software. So, what's up? My understanding is that
GNU programs can't depend on non-free software of any kind. Are we
breaking this rule? If so, why?

Joey