BUG #14542: 'readline' not found although it exists

The following bug has been logged on the website:

Bug reference: 14542
Logged by: Clive Boughton
Email address: clive(at)softimp(dot)com(dot)au
PostgreSQL version: 9.6.2
Operating system: Fedora 25
Description:

I've downloaded PG-9.6.2 version (from the postgreSQL site) to the install
from source.
When I run ./configure it reports that 'readline' is not found. The first
time I ran 'configure' the output was actually true. So I installed
'readline' version 6.7 (from source), checked that it had been installed at
/use/local/lib and ../include. Ran 'configure' for PG-9.2 again and
received the same output. I then wnet through the same process installing
'readline' 7.0. But alas the same result. I then tried 'libedit' but it
had it's own problems in not finding 'libncurses' or 'libtermcap'. Had had
enough of chasing tails and so now am writing for advice on a solution or
work-around.
Clive.