In the sendmail.mc file from the sendmail package, there is a reference to access.db which is supposed to incorporate a file called access.db.m4 from /usr/lib/sendmail-cf/feature/ into your sendmail configuration. The file is in the directory, but it is named access_db.m4 The simplest fix for this is to change the line with the access database feature to be FEATURE(`access_db') in the sendmail.mc file.
This is already fixed in sendmail-8.9.3-14.