libreadline only used with psql?

I've grepped through the source code, and the only thing I can find  
that uses readline (or libedit) is psql.

Is that correct?

If that's the case, how hard would it be to link only psql with  
readline (or libedit)?

Currently, if you ./configure with readline support, -lreadine (or - 
ledit) is added to the used-by-everything LIBS variable. Can we  
create a PSQL_LIBS variable and have ./configure populate that with  
libraries that will only be needed by psql? That way, ./configure can  
put -lreadline there and keep it out of LIBS so all the other  
binaries (postmaster, pg_ctl, pg_dump, pg_restore, etc) won't require  
it.

This request would be accompanied by a patch, but I wanted to ask  
about the feasibility of a PSQL_LIBS variable before going down that  
road.

Thanks!

- Chris