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