[Bug-readline] libreadline.so.7: undefined symbol: UP

[Jeffrey Walton]

I keep hitting this issue when building programs like cURL and Git
against Readline 7:

  $ ./configure
  configure: creating ./config.status
  config.status: creating Makefile
  gawk: symbol lookup error: /usr/local/lib64/libreadline.so.7:
undefined symbol: UP
  config.status: error: could not create Makefile

Sure enough:

  $ nm -D /usr/local/lib64/libreadline.so | egrep 'UP|DOWN|LEFT|RIGHT'
                 U UP

Others have hit the issue. Conventional wisdom from the various posts
is, downgrade to readline 6.3.

I've reviewed the CHANGELOG but but I'm not seeing what changed and why.

Could someone please please explain the change to me, and explain what
needs to be done to get the symbol back?

Thanks in advance,

Jeff