Re: libpcap detection and linking in tcpdump

[Guy Harris via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

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> From: Guy Harris <gharris () sonic net>
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> Date: Fri, 8 Jan 2021 14:49:42 -0800
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> On Jan 7, 2021, at 5:41 PM, Denis Ovsienko via tcpdump-workers <tcpdump-workers () lists tcpdump org> wrote:
>
> > 5 years of backward compatibility might be OK'ish, although from time
> > to time I run into such "long-term support" systems that in practice
> > mean someone keeps paying good money for "support" for 5-10 years, but
> > they don't get bugs fixed or new software versions backported. In my
> > own experience this tends to have something to do with RedHat Linux
> > distributions.
>
> Yeah, a lot of people are running old RHEL or CentOS - a lot of them keep asking about newer versions of Wireshark, 
> because the older RHEL/CentOS versions provide Wireshark 2.x packages when Wireshark's already up to 3.4.2.
>
> They probably provide old tcpdump, too, so people might want to build newer versions.
>
> I've checked in a change that picks up some code from a newer version of the pkg-config CMake module to make it work 
> with older versions.
>
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