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Sherpa is distributes as source code via fossil at http://fossil.etoyoc.com/fossil/gort
It can be downloaded as a source zipfile here
Sherpa is usable directly from the source repository via the "sherpa.tcl" script in the root.
To have sherpa run as "gort" in your environment add an alias:
alias sherpa="tclsh8.6 PATH_TO_SHERPA_REPO/gort.tcl"
Sherpa also has facilities to build itself as a self contained executable. in progress