There's a merged pull request on the void-packages repository

projectM: fix GUI applications for cross.
https://github.com/void-linux/void-packages/pull/25502

Description:
The template had a note:
`TODO: find out why these files aren't generated for the cross build`,
regarding the desktop files and icons that weren't being installed.
This was actually because the GUI application's weren't being built
at all! The build system could not find QT. Force enabling these
applications and doing qt shenanigans, including `build_helper=qmake`,
fixes these issues.