gentoo: X11 driver not configured with OpenGL

After installing kivy, I got a wonderful detailed error message:

[WARNING] [WinPygame   ] Video: failed (multisamples=2)
[WARNING] [WinPygame   ] trying without antialiasing
[ERROR  ] [Window      ] Unable to use <pygame> as windowprovider
[ERROR  ] [Window      ] The module raised an important error: 'X11 driver not configured with OpenGL'

It is not only detailed, it is nicely colored (color offline). However, it is wrong.

tunix ~ # grep Loading /var/log/Xorg.0.log | grep nvidia
[  1011.626] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
tunix ~ # equery -N u x11-drivers/nvidia-drivers | grep OpenGL
 + + X          : Controls whether the X.org driver, OpenGL libraries, XvMC libraries, and VDPAU libraries are installed
tunix ~ # nvidia-settings --glxinfo | grep 'direct rendering'
  direct rendering: Yes

In my case the reason for the error is the missing opengl USE flag of media-libs/libsdl.

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