I am working on an open source 3D solid modeling kernel (http://wildcat-cad.blogger.com and http://wildcat-cad.googlecode.com).  It allows users to sketch 2D profiles and extrude them into 3D to form mechanical parts.  The 2D sketches are constrained with dimensions (lengths, angles, etc.) and these constraints naturally form a system of equations.  An unrelated project (http://code.google.com/p/psketcher) has developed a very nice solver for these systems of equations.  The psketcher project uses GiNaC as its mathematical engine.

I would like to incorporate the psketcher solver into my kernel, but there may be a conflict in licenses.  My project is released under the BSD license, while I understand GiNaC to be under the GPL.  Is there any way to reconcile this problem other than changing to a different license?  I would love to use GiNaC for a couple of other purposes within my project also.  Any help would be appreciated.

Cheers,

   Graham