/usr/share/aclocal-1.4/ptrdiff.m4 is in automake1.4 1:1.4-p6-13.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | # From Ulrich Drepper.
# serial 1
AC_DEFUN([AM_TYPE_PTRDIFF_T],
[AC_CACHE_CHECK([for ptrdiff_t], am_cv_type_ptrdiff_t,
[AC_TRY_COMPILE([#include <stddef.h>], [ptrdiff_t p],
am_cv_type_ptrdiff_t=yes, am_cv_type_ptrdiff_t=no)])
if test $am_cv_type_ptrdiff_t = yes; then
AC_DEFINE(HAVE_PTRDIFF_T,1,[Define if system has ptrdiff_t type])
fi
])
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