Replying to myself:

On 12/12/2025 3:16 PM, Mark Geisert via Cygwin wrote:
On 12/12/2025 4:41 AM, Marco Atzeri via Cygwin wrote:
On 12/12/2025 10:21, Mark Geisert via Cygwin wrote:
[...]
There seems to be a larger issue here: somehow the 5.15.18 DLLs are not present in /usr/bin after installing those released packages. The debug version of them are installed into /usr/lib/debug/usr/bin but the stripped non-debug version are missing.  I will investigate further.

After the 5.15.18 DLLs get installed properly I can look into the version incompatibility problem.

I do not see the problem here, they seems in the right place

$ cygcheck -l libQt5Gui5
/usr/bin/cygQt5Gui-5.dll
/usr/bin/cygQt5OpenGL-5.dll
/usr/bin/cygQt5PrintSupport-5.dll
/usr/bin/cygQt5Widgets-5.dll
/usr/bin/cygQt5XcbQpa-5.dll

Unfortunately the names of the DLLs haven't changed between 5.9.* and 5.15.18.  One has to look at the update times to notice the problem:

Argh, PEBKAC. One has to download updated libQt5*.dll to get the latest cygQt5*.dll into /usr/bin. Newbie maintainer mistake. Sorry for the noise. Now working on Marco's mismatched version bug report.

..mark

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