AC_HEADER_ASSERT
AC_TYPE_UNSIGNED_LONG_LONG_INT
-AC_CHECK_TYPES([unsigned __int64])
+AC_CHECK_TYPES([unsigned __int64], [], [],
+ [unsigned __int64 foo = -1; /* avoid false positive result on VAX C */])
AC_C_FLEXIBLE_ARRAY_MEMBER
AC_C_INLINE
DX_C_FOR_DECLARATIONS