I'm using Buildroot 2018.11 and Qt5, no OpenGL.
I can launch my application with the -platform xcb in Xorg or -platform linuxfb:fb=/dev/fb0 in the console.
However, in both cases, the fonts are not rendered : absolutely no text is displayed (menu bar, labels, etc.).
I enabled Qt5 fontconfig support. I have some fonts under /usr/share/fonts (X11/ and liberation/). I made a symlink (ln -s /usr/share/fonts /usr/lib/fonts) so that Qt does not complain.
I'm really stuck here. Any idea ?
I fixed it by enabling fontconfig and rebuilding qt5base.