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The C and C++ Include Header Files

cat -n /usr/include/X11/extensions/xf86bigfstr.h

     1	#warning "xf86bigfstr.h is obsolete and may be removed in the future."
     2	#warning "include <X11/extensions/xf86bigfproto.h> for the protocol defines."
     3	#include <X11/extensions/xf86bigfproto.h>