These are the instructions for building hubfs on plan 9 from plan9.stanleylieber.com:
Source originally from https://bitbucket.org/mycroftiv/hubfs
; 9fs tcp!plan9.stanleylieber.com!9000
; bind /n/plan9.stanleylieber.com!9000/extra /n/extra
; cp /n/extra/src/hubfs.tip.tgz home/
; cd home/
; tar xvzf hubfs.tip.tgz
; mk all
; mk install