all -dev packages are in sdk repository, but I think that sgx packages are in "restricted" part of the repository which requires you to accept Nokia EULA (I think it was done when installing SDK) so I cannot give you direct link.

Sorry I didn't realise that pyglet has automatic wrapper generation.

http://maemo.org/packages/view/libgles2-sgx-img-dev/
http://maemo.org/packages/view/libgles1-sgx-img-dev/