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(autoconf.info)Generic Typedefs

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Generic Typedef Checks
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   This macro is used to check for typedefs not covered by the
particular test macros.

 - Macro: AC_CHECK_TYPE (TYPE, DEFAULT)
     If the type TYPE is not defined in `sys/types.h', or `stdlib.h' or
     `stddef.h' if they exist, define it to be the C (or C++) builtin
     type DEFAULT; e.g., `short' or `unsigned'.