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I have re-tested the current master (rev ccf0bea98) and it still has the
original bug, i.e. in the following, either ./configure should fail, or
HAVE_READLINE should be 1.

$ ./configure --with-readline >/dev/null
$ echo $?
0
$ grep HAVE_READLINE config.h
/* #undef HAVE_READLINE */

The test script I have attached to this message shows what behaviour I
expect, in particular how readline should work in a simila way to libjson,
and illustrates the problem in a reproducible way (on Debian).

I have attached an updated version of my fix. With the fix, the test
script it runs to completion successfully.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Forth, Tyne, Dogger: East or northeast 5 or 6. Moderate. Showers. Good.