Yea, Teem has a lot of stuff that doesn’t make any sense for ITK. So, when Nrrd was first added to ITK, I wrote some scripts to extract just those portions of Teem (not just which files, but which parts of which files) that are built to make NrrdIO (look at Utilities/NrrdIO/unteem.pl). I sort of regret that now, because it always means that updates to NrrdIO from the ITK side have to be merged back into Teem in a more tedious/manual manner. I forget when this last happened (sometime after 2009).
Matt - can you describe more how this “pull from and push contributions to upstream third party projects” might work? Or, is there another third-party project for which it is working, which could be an informative example?