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SIZEOF_type (see section Standard Symbols) to be the
size in bytes of type. If `type' is unknown, it gets a size
of 0. If no includes are specified, the default includes are used
(see section Default Includes). If you provide include, make sure to
include `stdio.h' which is required for this macro to run.
This macro now works even when cross-compiling. The unused argument was used when cross-compiling.
For example, the call
AC_CHECK_SIZEOF(int *)
defines SIZEOF_INT_P to be 8 on DEC Alpha AXP systems.
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