libpst @0.6.45_0 libpst violates the layout of the ports-filesystems

[dorothy@…]

sudo port install libpst

---> Computing dependencies for libpst ---> Fetching libpst ---> Attempting to fetch libpst-0.6.45.tar.gz from ​http://www.five-ten-sg.com/libpst/packages/ ---> Verifying checksum(s) for libpst ---> Extracting libpst ---> Configuring libpst ---> Building libpst ---> Staging libpst into destroot Warning: violation by /opt/local/man Warning: libpst violates the layout of the ports-filesystems! Warning: Please fix or indicate this misbehavior (if it is intended), it will be an error in future releases! ---> Installing libpst @0.6.45_0 ---> Activating libpst @0.6.45_0 ---> Cleaning libpst