How to make clang use a different tk framework version on MacOS?

[tastyminerals]

On Monday, 20 September 2021 at 21:58:27 UTC, tastyminerals wrote:
> My tkd GUI app started getting compiled with an outdated 8.5 Tk 
> framework version which gets shipped with command line tools: 
> `xcode-select --install`. As a result, the UI doesn't display 
> icons and is laggy. When you run the compiled tk app, you get a 
> notorious warning:
>
> ```
> DEPRECATION WARNING: The system version of Tk is deprecated and 
> may be removed in a future release. Please don't rely on it. 
> Set TK_SILENCE_DEPRECATION=1 to suppress this warning.
> ```
>
> This didn't happen before but here is why it probably started 
> to occur.
>
> I've recently been playing with uninstalling the MacPorts in 
> favour of homebrew and in the process I had to remove tk8.6 
> library which was installed once by MacPorts. I wasn't aware 
> that command line tools come with their own version of tk which 
> is 8.5. Somehow, after moving to homebrew, I rebuilt the app 
> and saw new warnings that never appeared before:
> ```
> ../../../../.dub/packages/tkd-1.1.13/tkd/source/tkd/image/png.d(83,7): Deprecation: Function `tkd.image.image.Image.embedBase64Data!("lock.png", EmbeddedPng!"lock.png").embedBase64Data` of type `@system EmbeddedPng!"lock.png"()` is not accessible from module `png`
> ```
>
> I tried coming back to MacPorts, reinstalling the command line 
> tools reinstalling the tkd and dub dependencies but nothing 
> worked so far. Maybe someone here has experience how to make 
> clang go and link against the tk 8.6 version installed by 
> MacPorts instead of 8.5. That would be of great help.

If anyone bumps into this issue. The reason why it happened was 
because I uninstalled Mac Ports and lost `pkgconfig` package. 
When this package is installed on the system, dub uses it to 
resolve the necessary flags and links with `-L-ltk8.6 
-L-ltkstub8.6 -L-ltcl8.6 -L-ltclstub8.6` instead of `8.5`.

Keep in mind that in order for your tkd app to work on Mac OS, 
you need to install quartz type of tk: `sudo port install tk 
+quartz`. After that your should be able to run the app.