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 2.1 Include Syntax
 ==================
 
 Both user and system header files are included using the preprocessing
 directive `#include'.  It has two variants:
 
 `#include <FILE>'
      This variant is used for system header files.  It searches for a
      file named FILE in a standard list of system directories.  You can
      prepend directories to this list with the `-I' option (
      Invocation).
 
 `#include "FILE"'
      This variant is used for header files of your own program.  It
      searches for a file named FILE first in the directory containing
      the current file, then in the quote directories and then the same
      directories used for `<FILE>'.  You can prepend directories to the
      list of quote directories with the `-iquote' option.
 
    The argument of `#include', whether delimited with quote marks or
 angle brackets, behaves like a string constant in that comments are not
 recognized, and macro names are not expanded.  Thus, `#include <x/*y>'
 specifies inclusion of a system header file named `x/*y'.
 
    However, if backslashes occur within FILE, they are considered
 ordinary text characters, not escape characters.  None of the character
 escape sequences appropriate to string constants in C are processed.
 Thus, `#include "x\n\\y"' specifies a filename containing three
 backslashes.  (Some systems interpret `\' as a pathname separator.  All
 of these also interpret `/' the same way.  It is most portable to use
 only `/'.)
 
    It is an error if there is anything (other than comments) on the line
 after the file name.
 

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