Problem solved. The installation instructions give two options: 1)
.\configure; make install or
2) installer.tcl. It says that make simply calls installer.tcl, so it
would seem unlikely that it would make a difference. However option 2)
works and option 1) does not.
tcllib is pretty big and, with option 2), it is easy to install, so it
is probably better not to include it in the cygwin tcltk package. It
would be nice to include it as a separate package, though, to avoid
hassles like the above. I realize now that the tcllib package in ruby
contains only a small fraction of the full library (though it does
include the file utilities that I wanted.)
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