These are the packages that would be merged, in order:

Calculating dependencies ...

!!! Problem resolving dependencies for =mail-mta/sendmail-8.18.2
 done!
Dependency resolution took 0.82 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=mail-mta/sendmail-8.18.2" has unmet requirements.
- mail-mta/sendmail-8.18.2::gentoo USE="ssl -berkdb -eai -fips -ldap -mbox -nis -sasl (-selinux) -tcpd -tinycdb -verify-sig"

  The following REQUIRED_USE flag constraints are unsatisfied:
    any-of ( berkdb tinycdb )

  The above constraints are a subset of the following complete expression:
    any-of ( berkdb tinycdb ) fips? ( ssl )