Too bad proprietary projects can't link against it. A loss for us all.

Seriously? GPL stuff can be used with any internal stuff, and almost any Free stuff. Isn't that enough? Where is the loss exactly?

Edit: okay, that wasn't the author's intention, and the consistency argument is a good one (least astonishment and all that). Still, the general argument holds.

Excellent point, I just changed the license to MIT to be consistent with curl. Thanks for catching that.