enabling bsm auditing in the build breaks sudo functionality when the auditing framework is not configured.
the function call bsm_audit_failure contains a check 

in bsm_audit.c

....
if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
       if (errno == ENOSYS)
            return;
       log_error (0, "Could not determine audit condition");
....

Solaris does not return the error ENOSYS but EINVALID when audit is disabled or not set up. 

in this case sudo refuses to allow the sudo to pass as it is in an error state not recognized.

adding EINVAL as possible error, maybe it would be more elegant to make it platform dependant but this is a quick fix.


.....
if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
       if (errno == ENOSYS  || errno == EINVAL)
            return;
       log_error (0, "Could not determine audit condition");

.....

with this small enhancement, sudo works transparantly wether auditing is enabled or not.

krgrds, Kris