after upgrade
apt-get install libfreetype6/jessie
apt-get install libsdl2-dev/jessie    (this couldn't find
Failed to load symbol SDL_GetDefaultAssertionHandler from shared library libSDL2.so)


Now:
Running ./examples/helloworld/bin/helloworld
2015-04-15 11:56:52.590 W Only hardcoded paths to TTF fonts are supported under linux so far. TODO: implement fontconfig support. 2015-04-15 11:56:52.590 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf SansSerif DejaVuSans italic=false weight=400 2015-04-15 11:56:52.590 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf SansSerif DejaVuSans italic=false weight=800 2015-04-15 11:56:52.590 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Oblique.ttf SansSerif DejaVuSans italic=true weight=400 2015-04-15 11:56:52.590 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-BoldOblique.ttf SansSerif DejaVuSans italic=true weight=800 2015-04-15 11:56:52.591 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono.ttf MonoSpace DejaVuSansMono italic=false weight=400 2015-04-15 11:56:52.591 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono-Bold.ttf MonoSpace DejaVuSansMono italic=false weight=800 2015-04-15 11:56:52.591 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono-Oblique.ttf MonoSpace DejaVuSansMono italic=true weight=400 2015-04-15 11:56:52.592 D FreeTypeFontManager.registerFont /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono-BoldOblique.ttf MonoSpace DejaVuSansMono italic=true weight=800
2015-04-15 11:56:52.593 D  Creating default theme
2015-04-15 11:56:52.827 D Loading string resources from file @embedded@/std_en.ini
2015-04-15 11:56:52.832 I  Applying loaded theme theme_default
2015-04-15 11:56:52.833 D  Creating SDL window
2015-04-15 11:56:52.837 I  Trying to create OpenGL 3.2 context
2015-04-15 11:56:52.839 E SDL_GL_CreateContext failed: Could not create GL context
2015-04-15 11:56:52.839 W  trying other versions of OpenGL
2015-04-15 11:56:52.840 I  Trying to create OpenGL 3.3 context
2015-04-15 11:56:52.842 E SDL_GL_CreateContext failed: Could not create GL context
2015-04-15 11:56:52.842 I  Trying to create OpenGL 3.1 context
2015-04-15 11:56:52.846 E SDL_GL_CreateContext failed: Could not create GL context
2015-04-15 11:56:52.846 I  Trying to create OpenGL 4.0 context
2015-04-15 11:56:52.850 E SDL_GL_CreateContext failed: Could not create GL context
2015-04-15 11:56:52.851 I  Trying to create OpenGL 2.1 context
2015-04-15 11:56:52.854 E SDL_GL_CreateContext failed: Could not create GL context
2015-04-15 11:56:52.854 W  OpenGL support is disabled


But glxgears works fine, glxinfo show direct rendering: yes.
BTW, why openGL for forms ?
in wiki:

"Fallback to pure Win32 API / SDL / XCB when OpenGL is not available (e.g. opengl dynamic library cannot be loaded)"
Why no fallback?

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