ensim etc # emerge -p proftpd

These are the packages that I would merge, in order:

Calculating dependencies ...done!
[blocks B     ] <net-ftp/proftpd-1.2.10-r6 (from pkg net-ftp/ftpbase-0.00)
[ebuild  N    ] net-ftp/ftpbase-0.00
[ebuild     U ] net-ftp/proftpd-1.2.10-r7 [1.2.10-r1]
ensim etc # emerge proftpd
Calculating dependencies ...done!

!!! Error: the <net-ftp/proftpd-1.2.10-r6 package conflicts with another package.
!!!        both can't be installed on the same system together.
!!!        Please use 'emerge --pretend' to determine blockers.

ensim etc #