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   Benjamin> The main objection is that GMP is licensed under LGPL which I
   Benjamin> believe conflicts with Python's very open license.

   >> If GMP itself isn't included with Python how can there be a licensing
   >> issue?

   Martin> On Windows, the GMP binaries would be incorporated into
   Martin> pythonxy.dll.  This would force anybody providing a copy of
   Martin> pythonxy.dll to also provide the sources of GMP.

As I understand it the proposal was to allow people to substitute GMP for
Python's long implementation.  Just deliver binaries with the Python long
version if you don't want to distribute the GMP source.  OTOH, it should be
no big deal to drop a zip archive of the GMP sources which correspond to the
code bound into the DLL.  OTOOH, doesn't Windows support dynamic linking?
Can't pythonxy.dll dynamically link to a gmpMN.dll?