2.0.0-beta fails to compile on Qt 6.4 due to Qt API mismatches and missing includes

[gagrilli]

Bug description
2.0.0-beta does not compile against Qt 6.4.2 despite declaring Qt 6.4.0 as the minimum required version in CMake.
Specifically, the first error reports:

QPalette::Accent

Compilation fails in:

libs/libgui/src/settings/appearanceconfigwidget.cpp

Errors:

error: no member named 'Accent' in 'QPalette'

this is not available in Qt 6.4.2 (Debian Bookworm Qt version). It appears to have been introduced in later Qt versions (Qt ≥ 6.6), AFAICT, with the minimal search I am able to perform.

CMake still declares:
find_package(Qt6 6.4.0 REQUIRED ...)

I am no developer. LLMs suggested I replace QPalette::Accent with a conditional for qt < 6.6.

#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
constexpr auto AccentRole = QPalette::Accent;
#else
constexpr auto AccentRole = QPalette::Highlight;
#endif

And I replaced qPalette::Accent with AccentRole throughout the file.

I was very happy that compilation proceeded.

The second error :
Compilation fails in:

libs/libgui/src/tools/modelexporthelper.cpp

Error:

use of undeclared identifier 'qApp'

Again, I am no developer. I just searched around and found that qApp is included in qApplication. Looked for that string , found it nowhere. In a hunch, I added:
#include

at the other includes of the file.
Compilation proceeded.

How to reproduce
Get a clean Debian 12 system. Add the qt6.4 (qt6-base-dev and libpq5 libpq-dev, qt6-svg-dev))
configuratino succeeds.
run cmake --build . Compilation fails with above errors

Expected behavior
I expected compilation to finish if I followed the instructions published.

Info about your desktop

• OS: Debian 12 (Bookworm)
• Compiler: GCC 12.x
• Qt: 6.4.2 (Debian packages)
• pgModeler: 2.0.0-beta (tarball build)
• Window manager: i3

Stacktrace / Debug info
N/A

Additional info
pgModeler runs fine after the workarounds I mentioned.

[gagrilli]

correction. On the second error (qApp) , I added
#include