FWIW, there's a long-running thread (Google Alerts for this for me) on the TCL core list where hwloc came up. Here's a random mail in the middle of the thread:
They apparently do not like Libtool. :-) I sent off-list mail to one of the developers; I shrudder a bit at them just forking/poaching a small number of hwloc routines (which I'm not sure would work well, anyway). We'll see what happens!
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