```
In file included from ../../tests/include/test.h:28,
                 from ../../tests/selfcheck.c:19:
../../tests/selfcheck.c: In function 'selfcheck_board_matches_table':
../../tests/selfcheck.c:142:21: error: 'board_matches_size' undeclared (first use in this function)
  142 |         assert_true(board_matches_size > 1);
      |                     ^~~~~~~~~~~~~~~~~~
../../tests/selfcheck.c:142:21: note: each undeclared identifier is reported only once for each function it appears in
../../tests/selfcheck.c:143:21: error: 'board_matches' undeclared (first use in this function)
  143 |         assert_true(board_matches[board_matches_size - 1].vendor_name == NULL);
```