[m-users.] Stuck trying to compile simple program

[Richard A. O'Keefe]

On 8/11/17 2:32 PM, zeldangit wrote:
> <https://gist.github.com/zeldangit/9448809d80f7613d74189feb9f5529ac>.

The key line is this:
   error: undefined symbol `+/2'.

You need

:- import_module int.

after your :- implementation. line.