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The C and C++ Include Header Files

cat -n /usr/include/X11/extensions/xf86dga.h

     1	#ifdef _XF86DGA_SERVER_
     2	
     3	#warning "xf86dga.h is obsolete and may be removed in the future."
     4	#warning "include <X11/extensions/xf86dgaconst.h> instead."
     5	#include <X11/extensions/xf86dgaconst.h>
     6	
     7	#else
     8	
     9	#warning "xf86dga.h is obsolete and may be removed in the future."
    10	#warning "include <X11/extensions/Xxf86dga.h> instead."
    11	#include <X11/extensions/Xxf86dga.h>
    12	
    13	#endif