#define FEATURE_EXT_framebuffer_object 1
#define FEATURE_EXT_pixel_buffer_object 1
#define FEATURE_EXT_texture_sRGB FEATURE_GL
+#define FEATURE_EXT_transform_feedback FEATURE_GL
#define FEATURE_APPLE_object_purgeable FEATURE_GL
#define FEATURE_ATI_fragment_shader FEATURE_GL