/usr/include/X11/extensions
Edit: /usr/include/X11/extensions/xf86dga.h (369B)
#ifdef _XF86DGA_SERVER_
#warning "xf86dga.h is obsolete and may be removed in the future."
#warning "include
instead."
#include
#else
#warning "xf86dga.h is obsolete and may be removed in the future."
#warning "include instead."
#include
#endif