apropos: dbm_map(mandoc.db): Obsolete format based on SQLite 3

[Otacílio]

Hello
Every time I run the apropos on aFreeBSD 11.1 machine I'm getting this 
error message before informing whether or not something appropriate exists.

apropos: dbm_map (mandoc.db): Obsolete format based on SQLite 3
apropos: /usr/local/man/mandoc.db: Inappropriate file type or format

This machine was upgraded from FreeBSD 11. In a other machine, FreeBSD 
10.3, I do not get this error message. Does anyone know how to solve this?

[]'s

-Otacilio