`calc' doesn't find its help files

[joerg van den hoff]

issuing `help overview' (or `help {any_other_topic}') in `calc' results 
in "no such help file". considering the manpage output, I presume, the 
help files are expected in /opt/local/lib/help but they are actually 
residing in /opt/local/share/calc/help.

I would appreciate a fix for this.
seen with port 2.5.3 and osx 10.12.6.

thank you

joerg