A few notes:
This year, we install the interpreter symlinks when the supporting texmf
files become available. Before we installed them all in texlive_base and
you could get dangling symlinks and confused users.
There are also a lot of Ruby-1.8 scripts in TeX Live, but we no longer
package such an old Ruby. There's too much to systematically test, so
for now we re-write the #! to a newer Ruby, and we can fix any problems
that arise on a case-by-case basis.
Tested by: matthieu@, cwen@, Jon Bernard and jca@.
Additional input from sthen@ and cwen@.
OK cwen@ and jca@.
Thank you all for your help!
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