> On 4 Oct 2023, at 12:06, Joel Roth via Dng <dng@???> wrote:
>
> Dear lovers and familiars of C,
>
> I've got a perl application using
> an interface library for gnu readline.
>
> I want to trying compiling the interface library
> against an older readline.
>
> Here are the libraries I have now. The
> single-digit suffixes are links to the
> decimal-versioned libraries.
>
> /lib/x86_64-linux-gnu/libreadline.so.5
> /lib/x86_64-linux-gnu/libreadline.so.5.2
> /lib/x86_64-linux-gnu/libreadline.so.6
> /lib/x86_64-linux-gnu/libreadline.so.6.3
> /lib/x86_64-linux-gnu/libreadline.so.8
> /lib/x86_64-linux-gnu/libreadline.so.8.2
>
> A likely way forward is to place the 6.3
> sources in /usr/include/readline and compile
> against that.
>
> I would also like to compile against 8.1, but can I (and do
> I need to) point the symlink at 8.1 without breaking things
> like bash that depend on version 8.2?
>
> Thanks all!
>
>
> --
> Joel Roth

It’s been a while since I touched C coding but I wonder if this page is of any use? Perhaps the soname section is relevant?

https://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html

Tom