How to build Qbittorrent on Windows with Qt 6.5

[mahkitah]

I'd like to build the latest qbit (4.6) with Qt 6.5 because of the dark mode support for Windows on Qt 6.5. I'm currently still running qbit 4.5.3, the last (and only?) official build with qt 6.5 because of that, but I'd really like to combine the native dark mode with the new theming options in qbit 4.6.

I've read this guide: https://github.com/qbittorrent/qBittorrent/wiki/Compilation:-Windows-%28MSVC-2019,-64-bit,-static-linkage%29
Unfortunately, the vcpkg package manager only has Qt5.
I have installed Visual Studio 2019, cmake and ninja, and used vcpkg to install the base dependencies (except qt) and libtorrent.
I also have installed Qt 6.5 on my system via their 'Online Installer'

I'm completely new to building software from source so I have no idea how to proceed from here.

edit:
CMake usually tells you what exactly it wants and the name of the variable to pass it as.
So several runs of the cmake command from the guide learned me that:

• zlib was missing, which I installed with vcpkg

and these needed to be added to the command:

• -DQT6=ON
• -DQt6_DIR="D:\Qt\6.5.3\msvc2019_64\lib\cmake\Qt6"

Currently I'm stuck here:

  Found package configuration file:

    D:/Qt/6.5.3/msvc2019_64/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake

  but it set Qt6Widgets_FOUND to FALSE so package "Qt6Widgets" is considered
  to be NOT FOUND.  Reason given by package:

  Qt6Widgets could not be found because dependency Qt6WidgetsTools could not
  be found.

  Configuring with --debug-find-pkg=Qt6WidgetsTools might reveal details why
  the package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.

Call Stack (most recent call first):
  D:/Qt/6.5.3/msvc2019_64/lib/cmake/Qt6/Qt6Config.cmake:157 (find_package)
  D:/Dowwn/vcpkg/scripts/buildsystems/vcpkg.cmake:859 (_find_package)
  src/gui/CMakeLists.txt:2 (find_package)


CMake Error at D:/Dowwn/vcpkg/scripts/buildsystems/vcpkg.cmake:859 (_find_package):
  Found package configuration file:

    D:/Qt/6.5.3/msvc2019_64/lib/cmake/Qt6/Qt6Config.cmake

  but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
  FOUND.  Reason given by package:

  Failed to find required Qt component "Widgets".

  Expected Config file at
  "D:/Qt/6.5.3/msvc2019_64/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake"
  exists

I'll continue to plough away at this, but if someone can add something helpful, please.

[xavier2k6]

Unfortunately, the vcpkg package manager only has Qt5

Qt 6.5.3 is available via vcpkg & in fact Qt 6.6.0 is currently being added.

• [Qt] Update to 6.5.3 microsoft/vcpkg#34122
• [Qt] Update to 6.6.0 microsoft/vcpkg#34426

---

https://github.com/qbittorrent/qBittorrent/wiki/Compilation:-Windows-%28MSVC-2019,-64-bit,-static-linkage%29#install-the-base-dependencies

qt5-base:x64-windows-static qt5-svg:x64-windows-static qt5-tools:x64-windows-static qt5-winextras:x64-windows-static

I believe these are now qtbase:x64-windows-static qtsvg:x64-windows-static qttools:x64-windows-static
qtwinextras:x64-windows-static isn't required for Qt6.

BTW/FYI Qt 6.5 Series have some caveats especially around Dark Mode & crashes on macOS hence why it was rolled back.

Should you wish to enable Dark Mode & run Official qBittorrent 4.6.0 (Qt 6.4.3) without building.....
Open command prompt
Navigate to where "qBittorrent" is installed ie official = C:\Program Files\qBittorrent
Run command qbittorrent -style fusion -platform windows:darkmode=2 for <=Qt 6.4 Series
Or
Run command qbittorrent -style fusion for Qt 6.5 Series

Note: Either of these commands won't be needed in a future release as fusion style has been implemented in master codebase & Qt are moving away from -platform windows:darkmode=1, -platform windows:darkmode=2 switches.

[mahkitah]

Thanks so much.
I now have that bittersweet feeling of having a solution, but also knowing that you could have prevented several hours of fruitless troubleshooting by being a bit more thorough in the first step.
I only searched vcpkg for qt6 and qt-6 and concluded that it didn't have Qt6.

I knew about the -style fusion command. That's what I use on qbit 4.5.3. -platform windows:darkmode=2 is new for me and very good to know about.
Qt 6.5 gets very ugly in dark mode when you have a non-neutral system colour, so I completely understand why it's not used.