Interesting. It was recently removed from nixpkgs due to being broken with modern hardening compiler flags; e.g.:

       > connect.c: In function 'd_connect':
       > connect.c:87:19: error: initialization of 'LONG' {aka 'int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
       >    87 |    DB_ADDR mdba = NULL;   /* db address of current member record */