[mohawkjohn]

So this is one problem with using an MIT license for SciRuby.

Our distribution gem -- well, technically, Claudio's distribution gem, but used by SciRuby -- has some Ruby code in it derived from C code in the GNU Scientific Library. Being a GNU library, GSL is licensed under the GPL.

Interestingly, the GSL-derived code is only utilized if the user does not have libgsl installed. And my understanding is that code which uses libgsl is not technically a derivative work, and therefore not required to be GPL'd itself.

I suppose one possibility is to abstract the GPL'd code into yet another gem (distribution-gsl?), which is itself licensed under the GPL.