openssh関連の情報を調べていたら、『hpn-ssh』なるものを知りました。なんでも、高速に使える openssh とのこと（間違っていたらすいません）。さっそく試してみようと、portinstall をしてみたところ、以下に示すようなエラーを出力されてしまいました。
===> Extracting for hpn-ssh-3.9.0.1.11,1 => MD5 Checksum OK for openssh-3.9p1.tar.gz. => No SHA256 checksum recorded for openssh-3.9p1.tar.gz. => MD5 Checksum mismatch for openssh-3.9p1-hpn11.diff. => No SHA256 checksum recorded for openssh-3.9p1-hpn11.diff. ===> Refetch for 1 more times files: openssh-3.9p1-hpn11.diff => openssh-3.9p1-hpn11.diff doesn't seem to exist in /usr/ports/distfiles/. => Attempting to fetch from http://www.psc.edu/networking/projects/hpn-ssh/. => MD5 Checksum OK for openssh-3.9p1.tar.gz. => No SHA256 checksum recorded for openssh-3.9p1.tar.gz. => MD5 Checksum mismatch for openssh-3.9p1-hpn11.diff. => No SHA256 checksum recorded for openssh-3.9p1-hpn11.diff. ===> Giving up on fetching files: openssh-3.9p1-hpn11.diff Make sure the Makefile and distinfo file (/usr/ports/security/hpn-ssh/distinfo) are up to date. If you are absolutely sure you want to override this check, type "make NO_CHECKSUM=yes [other args]". *** Error code 1 Stop in /usr/ports/security/hpn-ssh. *** Error code 1 Stop in /usr/ports/security/hpn-ssh.
Checksum が mismatch？！。そんなのどうすりゃ良いんだよ〜。
