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Ths OS is RHEL 6, but that's not so important because the entire collection,
including readline, is built from source and installed into an alternate
location. With the exception of a few essential shared objects from the
system, everything else is contained in the alternate location. Here's what
the readline INSTALL document says:
 Readline uses the termcap functions, but does not link with the termcap or
 curses library itself, allowing applications which link with readline 
 to choose an appropriate library.
So if you don't monkey with the readline distribution, but build and install it
as-is, you get a libreadline.so that's not linked to a termcap library. That's
the situation for our software collection.