ruby186 needs to have conflict set with ruby

[barracuda156]

Error: Failed to activate ruby: Image error: /opt/local/lib/libruby-static.a is being used by the active ruby186 port.  Please deactivate this port first, or use 'port -f activate ruby' to force the activation.
    while executing
"throw registry::image-error $msg"
    ("foreach" body line 47)
    invoked from within
"foreach file $imagefiles {
                set srcfile "${extracted_dir}${file}"

                # To be able to install links, we test if we can lst..."
    invoked from within
"registry::write {
            foreach file $imagefiles {
                set srcfile "${extracted_dir}${file}"

                # To be able to instal..."

They cannot be installed together.