[Interest] Qt setup for older Mac OS

[TurtleSoft Support]

To clarify, the build for older Macs is temporary: only for use in-house
for testing and preparing website pages.  We first started the project on
Qt 5.15 and will use that if possible.

The shipping OS is easier: built with the latest Qt, and running on
whichever OS versions it supports.
Casey McD

On Fri, Aug 14, 2026 at 8:45 AM Volker Hilsheimer <volker.hilsheimer at qt.io>
wrote:

> On 14 Aug 2026, at 03:46, TurtleSoft Support via Interest <
> interest at qt-project.org> wrote:
>
> Our project is almost ready to ship, built with the newest Qt version.
>
> However, we want to build a version for OS 10.14 Mojave. That way we can
> run it on the same machine as our prior 32-bit app for final testing.  In
> fact, a build for OS 10.12 Sierra would be ideal (last OS that doesn't
> require monthly fee for DreamWeaver).
>
> Is there information somewhere about the best combination of Qt, Qt
> Creator and Xcode for each OS?  We've tried installing several versions
> from the archives, but it won't build because of missing kits.
>
> Thanks,
> Casey McDermott
>
>
>
> Hi Casey,
>
>
> The last version of Qt to still support macOS 10.14 as the target was Qt
> 6.4:
>
> https://doc.qt.io/archives/qt-6.4/supported-platforms.html
>
> macOS 10.14 reached official end of life in October 2021.
>
> Qt 6.5 already requires at least macOS 11 as the target platform. Qt 6.5
> was an LTS release, but is at this point under extended security
> maintenance, which requires a separate agreement:
>
> https://www.qt.io/development/qt-framework/security-maintenance
>
> If you built your application with the newest Qt (6.11), then the target
> platform needs to be macOS 13 or higher:
>
> https://doc.qt.io/qt-6/supported-platforms.html
>
> The oldest commercially supported version of Qt is 6.8, and requires macOS
> 12 or higher.
>
>
>
> I’m not aware of a comprehensive overview of which Qt version to use in
> order to target which platform version. But asking google "what is the
> latest Qt version that supported macOS 10.14 as target platform” provides
> Qt 6.4 as the correct answer.
>
> Volker
>
>
>
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