5 AC_DEFUN(AM_TYPE_PTRDIFF_T,
6 [AC_CACHE_CHECK([for ptrdiff_t], am_cv_type_ptrdiff_t,
7 [AC_TRY_COMPILE([#include <stddef.h>], [ptrdiff_t p],
8 am_cv_type_ptrdiff_t=yes, am_cv_type_ptrdiff_t=no)])
9 if test $am_cv_type_ptrdiff_t = yes; then
10 AC_DEFINE(HAVE_PTRDIFF_T)