The dependencies of the "trueos-toolchain" packages are actually fairly small, and I don't see the "py27-pystemmer" and "zziplib" packages listed. It is probably a package farther down the dependency chain which is sucking those two in which just needs to be updated:
For example, "trueos-toolchain" depends on python27 for the sphinx documentation build framework:
trueos-toolchain -> py27-sphinx -> py-snowballstemmer -> py-pystemmer
trueos-toolchain -> tex-formats -> texlive-texmf -> texlive-base -> zziplib
So it would probably be best to talk to the maintainers of the "texlive-base" and "py-snowballstemmer" packages about cleaning up their port dependencies if possible.