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The following macros check for the declaration of variables and
functions. If there is no macro specifically defined to check for a
symbol you need, then you can use the general macros (see section 5.7.2 Generic Declaration Checks) or, for more complex tests, you may use
AC_TRY_COMPILE (see section 6.2 Examining Syntax).
5.7.1 Particular Declaration Checks Macros to check for certain declarations 5.7.2 Generic Declaration Checks How to find other declarations