cmake PG should ensure correct libdir, otherwise ports are broken on linux

[Christopher Jones]

Hi,

I would say unless there is a need to also use this flag on darwin builds, and it would appear not, then as long as whatever you add to the PG it *only* activates for linux, and not darwin, then it cannot have any serious impact.

Chris

> On 15 Sep 2024, at 1:59 PM, Sergey Fedorov <vital.had at gmail.com> wrote:
> 
> Currently nothing in MacPorts sets libdir for CMake ports. On MacOS this is no issue. On Linux this leaves multiple ports broken, since CMake throws libs into ${prefix}/lib64, where nothing looks for them, so all dependents are broken.
> As a few examples: libdeflate, lerc, libjpeg-turbo.
> 
> I think this should be fixed in cmake PG. Any objections to this?
> 
> Original PR for libdeflate, should be changed to a general fix: https://github.com/macports/macports-ports/pull/25757
> 

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