Re: Upgrading libpng: shall we move to 1.4.x or 1.5.x?

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Nils Philippsen <nils@xxxxxxxxxx> writes:
> On Fri, 2011-11-04 at 13:12 -0400, Tom Lane wrote:
>> I plan to provide the 1.2.x libpng shared library (and only the library,
>> not its devel support files) in a libpng-compat subpackage for the time
>> being.

> Any reason why the compat package ships the libpng-1.2.pc pkg-config
> file?

Yeah: I tried it without first, and found that I couldn't rebuild
anything.  There are boatloads of packages that have pkgconfig(libpng12)
as an RPM-visible dependency, so if the compat package doesn't supply
it, those packages won't install and you can't rebuild any of their
dependencies.  I have no idea why it was considered a good thing for RPM
to track this type of dependency, but it does.

> This made one of my packages use 1.5 headers, then later on
> attempt to link to libpng12.so which failed.

I doubt that's coming from the libpng12 pkgconfig; more likely, you have
some other package you're depending on that needs to be rebuilt first,
because its pkgconfig file currently says to use -lpng12 in link commands.

			regards, tom lane
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