--- /dev/null
+AC_DEFUN(PSI_CHECK_STDDEF, [
+ AC_CHECK_HEADERS(stddef.h)
+ PSI_TYPE(ptrdiff_t, int)
+ PSI_CONST(PTRDIFF_MIN, int)
+ PSI_CONST(PTRDIFF_MAX, int)
+ PSI_TYPE(size_t, uint)
+ PSI_CONST(SIZE_MAX, int)
+ PSI_TYPE(wchar_t, int)
+ PSI_CONST(WCHAR_MIN, int)
+ PSI_CONST(WCHAR_MAX, int)
+])