gliv port violation

[guy.kogus@…]

I just installed gliv, and received the following output:

$ sudo port install gliv
--->  Fetching gliv
--->  Attempting to fetch gliv-1.9.3.tar.gz from http://distfiles.macports.org/gliv 
--->  Attempting to fetch gliv-1.9.3.tar.gz from http://guichaz.free.fr/gliv/files/ 
--->  Verifying checksum(s) for gliv
--->  Extracting gliv
--->  Configuring gliv
--->  Building gliv
--->  Staging gliv into destroot
Warning: violation by /opt/local/man
Warning: gliv 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 gliv @1.9.3_0
--->  Activating gliv @1.9.3_0
--->  Cleaning gliv