shells/fish/Portfile specifies a checksum of 

522fba3b00939f9c36f2eac14ffc10a6 but i downloaded the package myself 

(from fishshell.org/files/1.21.11) and found that the checksum should be 

a4cf3dc089f819fe806644f7cb8dcf11.

also, while trying to determine the md5sum of the package, i discovered 

that the md5sum command appears to be missing from the corefiles port. 

"info corefiles" suggests that it should be present but i cannot find it 

in /opt/local/bin.