Actually, this is not a combination process, but a bootstrapping process. Here's the reference.
So, the 2100 was not obtained by combining with the TDC packages, for example.
Actually, the packages are being built on a GNU-Darwin-only box (no OSX), which has never seen the TDC packages. Regardless of that, all Darwin-ppc packages are Mac OS X compatible, although you may need an Xserver, such as the one from XonX.
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