Questions about how to open .rar files in file-roller have come up on
#FreeBSD-Gnome a few time lately. Would something like this be useful
in the FreeBSD Gnome FAQ?
How do I open .rar files with file-roller?
To open a .rar file with file-roller the rar port (archivers/rar) needs
to be installed at run time. The file-roller port does not need to be
rebuilt after installing rar.
Further, the rar port cannot be included as a run time dependency for
file-roller due to its license which prevents a FreeBSD package from
being created. The unrar port has a less restrictive license and can be
packaged but it's binary is not used by file-roller for .rar support.